Skip to main content

Platinum 900

to
67
789
70
483
393
140
110
108
83
46
41
22
21
20
16
13
11
10
8
6
6
3
3
2
1
1
1
15
10
10
9
8
Vintage Platinum GIA 1.02ctw Oval Green Purple Brazil Alexandrite Diamond Ring
Vintage Platinum GIA 1.02ctw Oval Green Purple Brazil Alexandrite Diamond Ring

Vintage Platinum GIA 1.02ctw Oval Green Purple Brazil Alexandrite Diamond Ring

Located in Montclair, NJ

--Stone(s):-- (10) Natural Genuine Alexandrite Chrysoberyl - Oval Brilliant Cut - Prong Set - Green - Blue Changing to Reddish Purple Color (Desirable color change) - 0.64ct (exact -...

Category

20th Century Engagement Rings

Materials

Alexandrite, Diamond, Platinum

Platinum GIA 5.05ct Cushion Oval Bezel Sapphire Solitaire Low Brushed Ring
Platinum GIA 5.05ct Cushion Oval Bezel Sapphire Solitaire Low Brushed Ring

Platinum GIA 5.05ct Cushion Oval Bezel Sapphire Solitaire Low Brushed Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Sapphire - Cushiony Oval Cut - Bezel Set - Blue Color - 5.05ct (Exact-certified) ** See Certification Details Below for Complete Info ** Material: ...

Category

21st Century and Contemporary American Solitaire Rings

Materials

Sapphire, Platinum

Peter Suchy .88 Carat Round Brilliant Cut Diamond Platinum Eternity Ring
Peter Suchy .88 Carat Round Brilliant Cut Diamond Platinum Eternity Ring

Peter Suchy .88 Carat Round Brilliant Cut Diamond Platinum Eternity Ring

By Peter Suchy

Located in Stamford, CT

This ring is not sizable but can be made into any finger or diamond size. 18 round brilliant cut diamonds, G VS SI approx. .88cts Size 6.5 Platinum Stamped: PT 900 3.9 grams Widt...

Category

21st Century and Contemporary Wedding Rings

Materials

Diamond, Platinum

Vintage French 18k Gold & Platinum GIA Yellow Sapphire & Diamond Geometric Ring
Vintage French 18k Gold & Platinum GIA Yellow Sapphire & Diamond Geometric Ring

Vintage French 18k Gold & Platinum GIA Yellow Sapphire & Diamond Geometric Ring

Located in Montclair, NJ

** Solid Well Made French Ring ** --Stone(s):-- (1) Natural Genuine Sapphire - Large Rectangular Step Cut - Bezel/Channel Set - Yellow Color - Strong Color - No Heat - Ceylon - 7ct (...

Category

20th Century French Cocktail Rings

Materials

Diamond, Yellow Sapphire, Gold, 18k Gold, Yellow Gold, Platinum

9.33 ctw Mid-Century No Heat Color Change Sapphire & Diamond Platinum Ring
9.33 ctw Mid-Century No Heat Color Change Sapphire & Diamond Platinum Ring

9.33 ctw Mid-Century No Heat Color Change Sapphire & Diamond Platinum Ring

Located in Tysons, VA

Type: Cocktail Ring Era / Style: Mid-Century Metal: Platinum Metal Purity: Plat-900 Setting Style: Prong Band Style: Plain Finish: High Polish Gemstone: Natural Blue Sapphire (Color-...

Category

21st Century and Contemporary Cocktail Rings

Materials

Diamond, Blue Sapphire, Platinum

Vintage Platinum 1.30ctw Round Diamond Large Fishtail Pave Set 5 Stone Band Ring
Vintage Platinum 1.30ctw Round Diamond Large Fishtail Pave Set 5 Stone Band Ring

Vintage Platinum 1.30ctw Round Diamond Large Fishtail Pave Set 5 Stone Band Ring

Located in Montclair, NJ

--Stone(s):-- (5) Natural Genuine Diamonds - Old Transitional Cut - Fishtail Pave Set - G/H Color - VS2/SI2 Clarity Total Carat Weight: 1.30 (approx.) Material: Solid .900 Platinum ...

Category

Vintage 1940s Band Rings

Materials

Diamond, Platinum

Antique Edwardian Platinum European Diamond Milgrain Engraved Dome Mosaic Ring
Antique Edwardian Platinum European Diamond Milgrain Engraved Dome Mosaic Ring

Antique Edwardian Platinum European Diamond Milgrain Engraved Dome Mosaic Ring

Located in Montclair, NJ

Total Carat Weight: 1.50 (approx.) Material: Solid .900 Platinum (may be slightly under karat due to age of production) Weight: 3.80 Grams Ring Size: 5 (We can custom size this ring...

Category

Vintage 1910s Edwardian Cocktail Rings

Materials

Diamond, Platinum

Antique Edwardian Platinum and Gold Old Mine Cut Diamond & Pearl Navette Brooch
Antique Edwardian Platinum and Gold Old Mine Cut Diamond & Pearl Navette Brooch

Antique Edwardian Platinum and Gold Old Mine Cut Diamond & Pearl Navette Brooch

Located in New York, NY

Weight: 13.0 Grams Primary Stone: .71ct Old Mine Cut Diamond (O-P, I1) Secondary Stone: 1.25ctw Old Mine Cut Diamonds (J, SI2) Other Stones: Pearls, Single Cut Diamonds (Carat weigh...

Category

Early 20th Century Edwardian Brooches

Materials

Diamond, Pearl, Yellow Gold, Platinum

Platinum GIA 5.89ct Large Oval Sapphire w/ Dual Halo Diamond Pendant Necklace
Platinum GIA 5.89ct Large Oval Sapphire w/ Dual Halo Diamond Pendant Necklace

Platinum GIA 5.89ct Large Oval Sapphire w/ Dual Halo Diamond Pendant Necklace

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Sapphire - Large Oval Brilliant Cut - Prong Set - Gorgeous Multi Shade Blue Color - 5.12ct (exact) ** See Certification Details Below for Complete I...

Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, Sapphire, Platinum

Antique Portuguese Diamond Cluster Ring Platinum Sz 4.75 Art Nouveau Jewelry
Antique Portuguese Diamond Cluster Ring Platinum Sz 4.75 Art Nouveau Jewelry

Antique Portuguese Diamond Cluster Ring Platinum Sz 4.75 Art Nouveau Jewelry

Located in Torrance, CA

The mount measures 14.5mm diameter (0.57 inches), rising 5mm from the finger. Metal & Hallmark: 900 platinum. The ring is not hallmarked though it has tested positive for platin...

Category

Early 20th Century Portuguese Art Nouveau Cocktail Rings

Materials

Diamond, White Diamond, Platinum

New Platinum GIA 1.19ct Cushion No Heat Ceylon Sapphire Solitaire Brushed Ring
New Platinum GIA 1.19ct Cushion No Heat Ceylon Sapphire Solitaire Brushed Ring

New Platinum GIA 1.19ct Cushion No Heat Ceylon Sapphire Solitaire Brushed Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Sapphire - Cushion Cut - Bezel Set - Pastel Blue Color - No Heat - Ceylon - 1.19ct (Exact-certified) ** See Certification Details Below for Complete...

Category

21st Century and Contemporary American Solitaire Rings

Materials

Sapphire, Platinum

Vintage Platinum 1.50ctw Round Solitaire w/ Baguette Diamond Engagement Ring
Vintage Platinum 1.50ctw Round Solitaire w/ Baguette Diamond Engagement Ring

Vintage Platinum 1.50ctw Round Solitaire w/ Baguette Diamond Engagement Ring

Located in Montclair, NJ

Total Carat Weight: 1.50 (approx.) Material: Solid .900 Platinum Weight: 2.90 Grams Ring Size: 5.0 (We can custom size this ring - please let us know prior to purchase for sizing in...

Category

Vintage 1940s Art Deco Engagement Rings

Materials

Diamond, Platinum

GIA Certified .56 Carat Natural Emerald Diamond Ballerina Platinum Cocktail Ring
GIA Certified .56 Carat Natural Emerald Diamond Ballerina Platinum Cocktail Ring

GIA Certified .56 Carat Natural Emerald Diamond Ballerina Platinum Cocktail Ring

Located in Stamford, CT

The emerald has a rich warm hue and nestled in a sophisticated ballet of sparkling diamonds, this ring exudes a harmonious allure that dances in the light. 1 octagonal Emerald cut ...

Category

Mid-20th Century Cocktail Rings

Materials

Diamond, Emerald, Platinum

COLORWONDER Tanzanite Rhodochrosite Pendant w. Chain 10 / 2 ct AAA+ Platinum
COLORWONDER Tanzanite Rhodochrosite Pendant w. Chain 10 / 2 ct AAA+ Platinum

COLORWONDER Tanzanite Rhodochrosite Pendant w. Chain 10 / 2 ct AAA+ Platinum

Located in Viena, Viena

this color combination is unique, the rhodochrosite is rarely found in this purity and colour, a piece of jewellery for customers who are looking for something absolutely special, a ...

Category

2010s Italian Modern Pendant Necklaces

Materials

White Diamond, Spinel, Tanzanite, Platinum

Antique Art Deco Platinum .36ctw Old European Diamond Engagement Ring w/ Accents
Antique Art Deco Platinum .36ctw Old European Diamond Engagement Ring w/ Accents

Antique Art Deco Platinum .36ctw Old European Diamond Engagement Ring w/ Accents

Located in Montclair, NJ

Total Carat Weight: 0.36 (approx.) Material: Solid .900 Platinum Weight: 2.19 Grams Ring Size: 6.0 (We can custom size this ring.)

Category

Vintage 1920s Solitaire Rings

Materials

White Diamond, Platinum

New Platinum GIA 1.10ctw D VVS Bar Channel Set Diamond East West Band Ring
New Platinum GIA 1.10ctw D VVS Bar Channel Set Diamond East West Band Ring

New Platinum GIA 1.10ctw D VVS Bar Channel Set Diamond East West Band Ring

Located in Montclair, NJ

--Stone(s):-- (3) Natural Genuine Diamonds - Emerald Cut - Bar Channel Set- D Color - VVS1-VS2 Clarity - 1.10ctw (exact - certified) ** See Certification Pictures for Complete Info *...

Category

21st Century and Contemporary American Band Rings

Materials

Diamond, Platinum

Very Nice Platinum 0.96ctw Oval Ruby w/ Marquise & Round Diamond Band Ring
Very Nice Platinum 0.96ctw Oval Ruby w/ Marquise & Round Diamond Band Ring

Very Nice Platinum 0.96ctw Oval Ruby w/ Marquise & Round Diamond Band Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Ruby - Oval Brilliant Cut - Prong Set - Deep Red Color - 0.70ct (exact) Natural Genuine Diamonds - 12 Round Brilliant Cut & 4 Marquise Cut - Pave & ...

Category

21st Century and Contemporary Band Rings

Materials

Diamond, Ruby, Platinum

EDWARDIAN Belle Epoque 1905 Platinum Festoon Necklace With 10.35 Ctw Diamonds
EDWARDIAN Belle Epoque 1905 Platinum Festoon Necklace With 10.35 Ctw Diamonds

EDWARDIAN Belle Epoque 1905 Platinum Festoon Necklace With 10.35 Ctw Diamonds

Located in Miami, FL

Hallmarks: Electronically tested for the assay and warranty of the .900/.999 platinum. Collateral: This Edwardian necklace is accompanied by a presentation jewelry box.

Category

Antique Early 1900s American Edwardian Drop Necklaces

Materials

Diamond, Platinum

GIA 1.26 Blue Round Sapphire Diamond Platinum Three Stone Engagement Ring
GIA 1.26 Blue Round Sapphire Diamond Platinum Three Stone Engagement Ring

GIA 1.26 Blue Round Sapphire Diamond Platinum Three Stone Engagement Ring

Located in Stamford, CT

which enhances the sapphire's brilliance. 1 round light blue no heat Sapphire, approx. total weight 1.26cts, GIA certificate #2175989286 2 round diamonds, approx. total weight .30c...

Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Sapphire, Blue Sapphire, Platinum

BELLE EPOQUE 1910 Antique Convertible Platinum Necklace Brooch With Diamonds
BELLE EPOQUE 1910 Antique Convertible Platinum Necklace Brooch With Diamonds

BELLE EPOQUE 1910 Antique Convertible Platinum Necklace Brooch With Diamonds

Located in Miami, FL

Hallmarks: Unmarked, and electronically tested for the assay and warranty of the platinum and the gold with results as follows, ".900/.999 Pt, .750/.999 Au."

Category

Vintage 1910s American Belle Époque Chain Necklaces

Materials

Diamond, White Diamond, Gold, Yellow Gold, Platinum

Antique Platinum 0.60ctw Old European Cut Diamond Floral Work Engagement Ring
Antique Platinum 0.60ctw Old European Cut Diamond Floral Work Engagement Ring

Antique Platinum 0.60ctw Old European Cut Diamond Floral Work Engagement Ring

Located in Montclair, NJ

Total Carat Weight: 0.60 (approx.) Material: Solid .900 Platinum Weight: 3.10 Grams Ring Size: 5.25 (We can custom size this ring - Please contact us prior to purchase with sizing ...

Category

21st Century and Contemporary Art Deco Engagement Rings

Materials

Diamond, Platinum

Platinum & 18k Yellow Gold Top Quality 1.28ctw E VS Pave Diamond Bypass Ring
Platinum & 18k Yellow Gold Top Quality 1.28ctw E VS Pave Diamond Bypass Ring

Platinum & 18k Yellow Gold Top Quality 1.28ctw E VS Pave Diamond Bypass Ring

Located in Montclair, NJ

--Stone(s):-- Numerous Natural Genuine Diamonds - Round Brilliant Cut - Pave Set - Very Fine Diamonds - E/F Color - VS1/VS2 Clarity - 1.28ctw (approx.) Material: Solid .900+ Platinu...

Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Gold, 18k Gold, Yellow Gold, Platinum

Platinum & Gold 1.80ctw High Quality Square Sapphire w/ Diamond Cuff Earrings
Platinum & Gold 1.80ctw High Quality Square Sapphire w/ Diamond Cuff Earrings

Platinum & Gold 1.80ctw High Quality Square Sapphire w/ Diamond Cuff Earrings

Located in Montclair, NJ

Total Carat Weight: 1.80 (approx.) Material: Solid .900+ Platinum Earrings w/ 14k White Gold Posts & Backs Weight: 15 Grams Backing: Posts w/ Butterfly Closures (Pierced ears ar...

Category

21st Century and Contemporary Drop Earrings

Materials

Diamond, Sapphire, Gold, 14k Gold, White Gold, Platinum

2.53ct Vivid Blue Oval Cut Santa Maria Aquamarine & Pavé Diamond Platinum Ring
2.53ct Vivid Blue Oval Cut Santa Maria Aquamarine & Pavé Diamond Platinum Ring

2.53ct Vivid Blue Oval Cut Santa Maria Aquamarine & Pavé Diamond Platinum Ring

Located in Birmingham, GB

This fine quality Santa Maria aquamarine is set in a beautiful modern 900 platinum ring with pavé set natural diamond shoulders of E-G colour SI-VS clarity. 0.81 carat total (hallmar...

Category

21st Century and Contemporary Cluster Rings

Materials

Aquamarine, Diamond, White Diamond, Platinum

4.17ct GIA Certified Colombian Emerald & Diamond Pear Cut Platinum Halo Pendant
4.17ct GIA Certified Colombian Emerald & Diamond Pear Cut Platinum Halo Pendant

4.17ct GIA Certified Colombian Emerald & Diamond Pear Cut Platinum Halo Pendant

By Gems and Jewels UK

Located in Birmingham, GB

These are all set in a beautiful 900 platinum pendant necklace. Beautifully set and finished.

Category

21st Century and Contemporary Pendant Necklaces

Materials

Diamond, White Diamond, Emerald, Platinum

Antique Art Deco Platinum GIA 1.32ctw Old Cut Diamond Engagement Ring
Antique Art Deco Platinum GIA 1.32ctw Old Cut Diamond Engagement Ring

Antique Art Deco Platinum GIA 1.32ctw Old Cut Diamond Engagement Ring

Located in Montclair, NJ

Total Carat Weight: 1.32 (approx.) Material: Solid .900 Platinum Weight: 2.66 Grams Ring Size: 5.5 (Fitted on a finger.

Category

Vintage 1920s Art Deco Engagement Rings

Materials

Diamond, Platinum

1.76ctw Oval Emerald Diamond Ring Platinum 18k Gold Engagement Size 4.75
1.76ctw Oval Emerald Diamond Ring Platinum 18k Gold Engagement Size 4.75

1.76ctw Oval Emerald Diamond Ring Platinum 18k Gold Engagement Size 4.75

Located in McLeansville, NC

Gemstone Information: - Natural Emerald - Carats - 1.61ct Cut - Oval Color - Green Treatment - Oiling GIA - 6224333148 - Natural Diamonds - Total Carats - 0.15ctw Cut - Transitiona...

Category

2010s Fashion Rings

Materials

Diamond, Emerald, 18k Gold, Platinum

Antique Edwardian Diamond Band Sz 6.75 Ring Platinum Wedding Eternity Jewelry
Antique Edwardian Diamond Band Sz 6.75 Ring Platinum Wedding Eternity Jewelry

Antique Edwardian Diamond Band Sz 6.75 Ring Platinum Wedding Eternity Jewelry

Located in Torrance, CA

The band measures 3mm wide (0.11 inches), rising 1.5mm from the finger. Metal & Hallmark: 900 platinum. The ring is not hallmarked though it has tested positive for platinum.

Category

Early 20th Century American Edwardian Wedding Rings

Materials

Diamond, White Diamond, Platinum

CARTIER London 1960 Gipsy Ring In Platinum With Burmese Ruby & Diamonds
CARTIER London 1960 Gipsy Ring In Platinum With Burmese Ruby & Diamonds

CARTIER London 1960 Gipsy Ring In Platinum With Burmese Ruby & Diamonds

By Cartier

Located in Miami, FL

This fabulous vintage ring has been masterfully hand crafted in solid .900/.999 platinum with a delicate and thin brushed finish.

Category

Vintage 1960s French Modernist Cocktail Rings

Materials

Diamond, Ruby, White Diamond, Platinum

CARTIER Art-Deco 1938 Certified Necklace In Platinum With Diamonds & Sapphires
CARTIER Art-Deco 1938 Certified Necklace In Platinum With Diamonds & Sapphires

CARTIER Art-Deco 1938 Certified Necklace In Platinum With Diamonds & Sapphires

By Cartier

Located in Miami, FL

This necklace has been masterfully crafted as a station with a cluster in solid .900/.999 platinum with high polished finish and platinum bezels for the settings of the diamonds.

Category

Vintage 1930s French Art Deco Pendant Necklaces

Materials

Diamond, Sapphire, White Diamond, Blue Sapphire, Platinum

Platinum 3.67ctw GIA Octagonal Green Emerald w/ Baguette & Round Diamond Ring
Platinum 3.67ctw GIA Octagonal Green Emerald w/ Baguette & Round Diamond Ring

Platinum 3.67ctw GIA Octagonal Green Emerald w/ Baguette & Round Diamond Ring

Located in Montclair, NJ

Total Carat Weight: 3.67 (approx.) Material: Solid .900+ Platinum Weight: 10.54 Grams Ring Size: 8.5 (Fitted on a finger.

Category

21st Century and Contemporary Cocktail Rings

Materials

Diamond, Emerald, Platinum

1.04ct Princess Diamond Engagement Ring 18k Gold Platinum Size 5.5-5.75
1.04ct Princess Diamond Engagement Ring 18k Gold Platinum Size 5.5-5.75

1.04ct Princess Diamond Engagement Ring 18k Gold Platinum Size 5.5-5.75

Located in McLeansville, NC

Gemstone Information: - Natural Diamond - Carats - 1ct Cut - Princess Color - G - H Clarity - VS2 - Natural Diamonds - Total Carats -0.04ctw Cut - Round Brilliant Color - G - H Cl...

Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, 18k Gold, White Gold, Platinum

Vintage Platinum 1.0ctw Carre Step Cut Diamond High Profile Band Ring Size 5
Vintage Platinum 1.0ctw Carre Step Cut Diamond High Profile Band Ring Size 5

Vintage Platinum 1.0ctw Carre Step Cut Diamond High Profile Band Ring Size 5

Located in Montclair, NJ

–Stone(s): – (8) Natural Genuine Diamonds - Carre Rectangular Step Cut - Prong Set - F-G Color - VS1-VS2 Clarity - 1.0ctw (approx.) Material: Solid .900 Platinum Total Weight: 4.6...

Category

21st Century and Contemporary Band Rings

Materials

Diamond, Platinum

Vintage Diamond Skunk Brooch 18k Yellow Gold Platinum Fine Animal Jewelry
Vintage Diamond Skunk Brooch 18k Yellow Gold Platinum Fine Animal Jewelry

Vintage Diamond Skunk Brooch 18k Yellow Gold Platinum Fine Animal Jewelry

Located in Torrance, CA

Metal & Hallmark: 18 karat yellow gold and 900 platinum. The brooch is hallmarked "18k" and "PT"

Category

Late 20th Century American Modern Brooches

Materials

Diamond, White Diamond, Platinum, Yellow Gold, 18k Gold, Gold

Platinum GIA Large 7.38ctw Very Fine Colombian Emerald w/ Diamond Ballerina Ring
Platinum GIA Large 7.38ctw Very Fine Colombian Emerald w/ Diamond Ballerina Ring

Platinum GIA Large 7.38ctw Very Fine Colombian Emerald w/ Diamond Ballerina Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Emerald - Octagonal Step Cut - Prong Set - Very Fine - Vibrant Green Color - Colombian - F2 Clarity Enhanced - 6.53ct (exact) ** See Certification D...

Category

21st Century and Contemporary Cocktail Rings

Materials

Diamond, Emerald, Platinum

1.06 Carat Diamond Sapphire Enamel Platinum Midcentury Engagement Ring
1.06 Carat Diamond Sapphire Enamel Platinum Midcentury Engagement Ring

1.06 Carat Diamond Sapphire Enamel Platinum Midcentury Engagement Ring

Located in Stamford, CT

EGL certified. note: the red enamel is a deep red, almost black looking, the red tone can be seen under strong light. 1 round Old European cut diamond approx. total weight 1.06cts,...

Category

Mid-20th Century Engagement Rings

Materials

Blue Sapphire, Diamond, Sapphire, Enamel, Platinum

Classic Platinum GIA 4.23ctw Burma Spinach Green A Jade w/ Diamond Ring
Classic Platinum GIA 4.23ctw Burma Spinach Green A Jade w/ Diamond Ring

Classic Platinum GIA 4.23ctw Burma Spinach Green A Jade w/ Diamond Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Jade - 100% Natural A Jade - Oval Cabochon Cut - Prong Set - Spinach Green Color - Burma - 12.57 x 9.75 x 3.46 mm - 3.53ct (exact) ** See Certificat...

Category

21st Century and Contemporary Cocktail Rings

Materials

Diamond, Jade, Platinum

Vintage Platinum Large 13.64ctw GIA Red Orange Play Opal Diamond Sides Ring
Vintage Platinum Large 13.64ctw GIA Red Orange Play Opal Diamond Sides Ring

Vintage Platinum Large 13.64ctw GIA Red Orange Play Opal Diamond Sides Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Opal - Oval Double Cabochon Cut - Prong Set - Gray Color w/ Very Nice Play of Colors with Lots of Red & Orange Colors - 22.20x15.42x6.27 mm / 13.23c...

Category

20th Century Cocktail Rings

Materials

Diamond, Opal, Platinum

New Solid Platinum 0.80ctw Square Sapphire w/ Diamond Halo Geometric Ring
New Solid Platinum 0.80ctw Square Sapphire w/ Diamond Halo Geometric Ring

New Solid Platinum 0.80ctw Square Sapphire w/ Diamond Halo Geometric Ring

Located in Montclair, NJ

Total Carat Weight: 0.80 (approx.) Material: Solid .900+ Platinum (tested) - Stamped 950 Weight: 6.77 Grams Ring Size: 6.5 (Fitted on a finger.

Category

21st Century and Contemporary American Engagement Rings

Materials

Diamond, Sapphire, Platinum

FRENCH 1938 Art-Deco Platinum Clips Earrings With 27.62 Ctw Diamonds &
FRENCH 1938 Art-Deco Platinum Clips Earrings With 27.62 Ctw Diamonds &

FRENCH 1938 Art-Deco Platinum Clips Earrings With 27.62 Ctw Diamonds &

Located in Miami, FL

The gorgeous pair has been designed as a left and right in solid .900/.999 platinum and embellished with forty-two natural white colorless diamonds and two blue turquoises.

Category

Vintage 1930s French Art Deco Clip-on Earrings

Materials

Diamond, Turquoise, White Diamond, Platinum

1.60ct FINE Top Grade Australian Black Opal & Diamond Three Stone Platinum Ring
1.60ct FINE Top Grade Australian Black Opal & Diamond Three Stone Platinum Ring

1.60ct FINE Top Grade Australian Black Opal & Diamond Three Stone Platinum Ring

By Gems and Jewels UK

Located in Birmingham, GB

Ring weighs 6.03g and and is fully hallmarked by UK assay office as 900 platinum to guarantee metal quality. All our jewellery is posted safely and securely in leatherette boxes.

Category

21st Century and Contemporary Three-Stone Rings

Materials

Diamond, Opal, Black Opal, Platinum

MODERNIST Pendant Necklace-Chain In Platinum With Graduated VVS White Diamonds
MODERNIST Pendant Necklace-Chain In Platinum With Graduated VVS White Diamonds

MODERNIST Pendant Necklace-Chain In Platinum With Graduated VVS White Diamonds

Located in Miami, FL

Pendant necklace in platinum with diamonds. This is a classic modernist pendant necklace-chain crafted in solid .900/.999 platinum with polished finish and embellished with five nat...

Category

Late 20th Century American Modernist Pendant Necklaces

Materials

Diamond, White Diamond, Platinum

Antique 1.10 Carat Ruby and 1.18 Carat Diamond, Platinum Ring Circa 1935
Antique 1.10 Carat Ruby and 1.18 Carat Diamond, Platinum Ring Circa 1935

Antique 1.10 Carat Ruby and 1.18 Carat Diamond, Platinum Ring Circa 1935

Located in Jesmond, Newcastle Upon Tyne

The antique ruby ring is hallmarked to the interior of the shank with the platinum mark (.100 IRID .900 PLAT). This impressive cabochon ruby and diamond ring in platinum is supplied...

Category

Vintage 1930s Unknown Cocktail Rings

Materials

Diamond, Ruby, Platinum

Platinum 4.55ctw Elongated Step Cut Aquamarine & Old Cut Diamond Cocktail Ring
Platinum 4.55ctw Elongated Step Cut Aquamarine & Old Cut Diamond Cocktail Ring

Platinum 4.55ctw Elongated Step Cut Aquamarine & Old Cut Diamond Cocktail Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Aquamarine - Elongated Rectangular Step Cut - Panel Prong Set - Sky Blue Color w/ Natural Inclusions - 3.86ct (exact) (2) Natural Genuine Diamonds -...

Category

2010s American Cocktail Rings

Materials

Aquamarine, Diamond, Platinum

Vintage Platinum 3.04ctw GIA Round Brilliant Green Emerald Baguette Diamond Ring
Vintage Platinum 3.04ctw GIA Round Brilliant Green Emerald Baguette Diamond Ring

Vintage Platinum 3.04ctw GIA Round Brilliant Green Emerald Baguette Diamond Ring

Located in Montclair, NJ

Total Carat Weight: 3.04 (approx.) Material: Solid .900 Platinum Weight: 4.12 Grams Ring Size: 6.0 (We can custom size this ring - Please contact us prior to purchase with sizing in...

Category

Vintage 1950s Solitaire Rings

Materials

Emerald, Platinum

Diamond Marquise Platinum Gold Ring 1.11 ct 0.36 ct exclusive and excellent
Diamond Marquise Platinum Gold Ring 1.11 ct 0.36 ct exclusive and excellent

Diamond Marquise Platinum Gold Ring 1.11 ct 0.36 ct exclusive and excellent

Located in Viena, Viena

an exclusive ring in 900 platinum and 750 yellow gold...excellently designed by the combination of pure white diamond baguettes in 900 platinum totaling approx. 0.36 ct TW (fine whit...

Category

2010s Italian Modern Solitaire Rings

Materials

Diamond, Platinum, Gold

Platinum GIA High Quality 3.21ctw Tsavorite w/ Diamond Halo Flower Cluster Ring
Platinum GIA High Quality 3.21ctw Tsavorite w/ Diamond Halo Flower Cluster Ring

Platinum GIA High Quality 3.21ctw Tsavorite w/ Diamond Halo Flower Cluster Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Tsavorite - Oval Cut - Prong Set - Deep Green Color - High Quality - 2.12ct (exact - stamped) **See Certification Details Below** (8) Natural Genuin...

Category

21st Century and Contemporary Solitaire Rings

Materials

Diamond, Tsavorite, Platinum

Antique Edwardian Platinum 1.26ctw GIA European Diamond Filigree Engagement Ring
Antique Edwardian Platinum 1.26ctw GIA European Diamond Filigree Engagement Ring

Antique Edwardian Platinum 1.26ctw GIA European Diamond Filigree Engagement Ring

Located in Montclair, NJ

Total Carat Weight: 1.26 (approx.) Material: Solid .900 Platinum Weight: 3.74 Grams Ring Size: 6.5 (We can custom size this ring - Please contact us prior to purchase with sizing in...

Category

Antique Early 1900s Edwardian Engagement Rings

Materials

Diamond, Platinum

Vintage Platinum GIA 2.82ctw Pear Cut Sapphire w/ Baguette Diamond Sides Ring
Vintage Platinum GIA 2.82ctw Pear Cut Sapphire w/ Baguette Diamond Sides Ring

Vintage Platinum GIA 2.82ctw Pear Cut Sapphire w/ Baguette Diamond Sides Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Sapphire - Pear Cut - Prong Set - Royal Blue Color - 2.57ct (exact - stamped) **See Certification Details Below For More Info** (2) Natural Genuine ...

Category

20th Century Cocktail Rings

Materials

Diamond, Sapphire, Platinum

Vintage 14k Gold Platinum Diamond Chain w/ Opal Ruby Swan Charm Pendant Necklace
Vintage 14k Gold Platinum Diamond Chain w/ Opal Ruby Swan Charm Pendant Necklace

Vintage 14k Gold Platinum Diamond Chain w/ Opal Ruby Swan Charm Pendant Necklace

Located in Montclair, NJ

Material: Chain: Solid .900 Platinum Center w/ Solid 14k White Gold Snake Link Charm: Solid .900 Platinum Total Weight: 22.66 Grams Charm Height: 14.0mm (0.55") Charm Width: 18mm (0....

Category

20th Century Pendant Necklaces

Materials

Diamond, Opal, Ruby, 14k Gold, Platinum

Platinum GIA 10.19ctw Elongated Emerald Cut Sapphire & Diamond Custom Made Ring
Platinum GIA 10.19ctw Elongated Emerald Cut Sapphire & Diamond Custom Made Ring

Platinum GIA 10.19ctw Elongated Emerald Cut Sapphire & Diamond Custom Made Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Sapphire - Elongated Emerald Cut - Prong Set - Clean Vivid Blue Color - Heated -8.06ct (exact - certified) ** See Certification Details Below for Co...

Category

21st Century and Contemporary Cocktail Rings

Materials

Diamond, Sapphire, Platinum

Vintage Platinum 4.50ctw 18 Marquise Prong Diamond Eternity Wedding Band Ring
Vintage Platinum 4.50ctw 18 Marquise Prong Diamond Eternity Wedding Band Ring

Vintage Platinum 4.50ctw 18 Marquise Prong Diamond Eternity Wedding Band Ring

Located in Montclair, NJ

--Stone(s):-- (18) Natural Genuine Diamonds - Marquise Cut - Prong Set - F/G Color - VS1/VS2 Clarity Total Carat Weight: 4.50 + (approx.) Material: Solid .900 Platinum Weight: 5.87 ...

Category

Vintage 1950s Retro Band Rings

Materials

Diamond, Platinum

Platinum GIA 6.01ctw Burma No Heat Greenish Blue Sapphire Baguette Diamond Ring
Platinum GIA 6.01ctw Burma No Heat Greenish Blue Sapphire Baguette Diamond Ring

Platinum GIA 6.01ctw Burma No Heat Greenish Blue Sapphire Baguette Diamond Ring

Located in Montclair, NJ

Total Carat Weight: 6.01 (approx.) Material: Solid .900+ Platinum Weight: 4.80 Grams Ring Size: 7.5 (Fitted on a finger.

Category

20th Century Cocktail Rings

Materials

Diamond, Sapphire, Platinum

Platinum Gia 1.54ctw Octagonal Deep Green Tsavorite & Diamond 3 Stone Ring
Platinum Gia 1.54ctw Octagonal Deep Green Tsavorite & Diamond 3 Stone Ring

Platinum Gia 1.54ctw Octagonal Deep Green Tsavorite & Diamond 3 Stone Ring

Located in Montclair, NJ

Total Carat Weight: 1.54 (approx.) Material: Solid .900+ Platinum Weight: 5.41 Grams Ring Size: 5.5 (Fitted on a finger.

Category

21st Century and Contemporary Wedding Rings

Materials

Diamond, Tsavorite, Platinum

Platinum GIA 1.45ct Vivid Red Ruby Pear No Heat & Diamond Sides Ring
Platinum GIA 1.45ct Vivid Red Ruby Pear No Heat & Diamond Sides Ring

Platinum GIA 1.45ct Vivid Red Ruby Pear No Heat & Diamond Sides Ring

Located in Montclair, NJ

--Stone(s):-- (1) Natural Genuine Ruby - Well Cut - Pear Cut - Prong Set - Vivid Clean Pure Red Color - No Heat - 1.02ct (exact stamped) ** See Certification Details Below for Comple...

Category

21st Century and Contemporary Cocktail Rings

Materials

Diamond, Ruby, Platinum

1.16 Ct GIA Cert No oil Emerald Ring With Natural Diamond And Platinum Gold
1.16 Ct GIA Cert No oil Emerald Ring With Natural Diamond And Platinum Gold

1.16 Ct GIA Cert No oil Emerald Ring With Natural Diamond And Platinum Gold

By Gems WB

Located in bangkok, TH

E037 1.16 Ct GIA Cert No oil Emerald With Natural Diamond And Platinum Gold 1-Main stone : 1.16ct no Oil Emerald GIA Zambia nearly eye clean 2-Surrounding stone: D-0.385/150P/16...

Category

2010s Solitaire Rings

Materials

Diamond, Emerald, Platinum

4.65ct GIA Certified Octagon Vivid Blue Ceylon Sapphire & Diamond Platinum Ring
4.65ct GIA Certified Octagon Vivid Blue Ceylon Sapphire & Diamond Platinum Ring

4.65ct GIA Certified Octagon Vivid Blue Ceylon Sapphire & Diamond Platinum Ring

By Gems and Jewels UK

Located in Birmingham, GB

All set in a beautifully made 900 platinum five stone ring. Ring size UK N - US 6.75 - EU 54.

Category

21st Century and Contemporary Cluster Rings

Materials

Diamond, White Diamond, Sapphire, Blue Sapphire, Platinum

Vintage Art Deco 2.16ct Diamond Ring Calibre Emeralds Sz 7 Platinum Elongated
Vintage Art Deco 2.16ct Diamond Ring Calibre Emeralds Sz 7 Platinum Elongated

Vintage Art Deco 2.16ct Diamond Ring Calibre Emeralds Sz 7 Platinum Elongated

Located in Torrance, CA

The mount measures 28mm in length (1.10 inches) and 15mm wide (0.59 inches) rising 5mm from the finger. Metal & Hallmark: 900 platinum. The ring is not hallmarked though it has ...

Category

Early 20th Century American Art Deco Cocktail Rings

Materials

Diamond, White Diamond, Emerald, Platinum

Vintage Platinum 1ctw Carré Step Cut VS Diamond Channel 5 Stone Band Ring
Vintage Platinum 1ctw Carré Step Cut VS Diamond Channel 5 Stone Band Ring

Vintage Platinum 1ctw Carré Step Cut VS Diamond Channel 5 Stone Band Ring

Located in Montclair, NJ

–Stone(s): – (5) Natural Genuine Diamonds - Carré Square Step Cut - Channel Set - G/H Color - VS1/VS2 Clarity - 1.0ctw (exact) Material: Solid .900 Platinum (tested) - Stamped PT900...

Category

20th Century Band Rings

Materials

Diamond, Platinum

ART-DECO 1930 Graduated Jadeite Green Jade Necklace Sautoir In Platinum &
ART-DECO 1930 Graduated Jadeite Green Jade Necklace Sautoir In Platinum &

ART-DECO 1930 Graduated Jadeite Green Jade Necklace Sautoir In Platinum &

Located in Miami, FL

The necklace is composed by one-hundred-twenty-three graduated beads carved from natural jadeite jade and a security boxed lock crafted in solid .900/.999 platinum, which is embellis...

Category

Vintage 1930s American Art Deco Multi-Strand Necklaces

Materials

Diamond, Jade, White Diamond, Platinum

  • 1
  • ...
Get Updated with New Arrivals
Save "Platinum 900", and we’ll notify you when there are new listings in this category.

Platinum 900 For Sale on 1stDibs

Find the exact platinum 900 you’re shopping for in the variety available on 1stDibs. Every item for sale was constructed with extraordinary care, often using Platinum, Gold and 18k Gold. Our collection of these items for sale includes 38 vintage editions and 77 modern creations to choose from as well. Finding the perfect platinum 900 may mean sifting through those created during different time periods — you can find an early version that dates to the 20th Century and a newer variation that were made as recently as the 21st Century. There have been many well-made iterations of the classic platinum 900 over the years, but those made by Malpani Jewels, SHIHARA and Spark Creations are often thought to be among the most beautiful. See these pages for a round cut iteration of this accessory, while there are also oval cut cut and marquise cut cut versions available here, too. Finding a platinum 900 for sale for women should be easy, but there are 55 pieces available to browse for unisex as well as men, too.

How Much is a Platinum 900?

Prices for a platinum 900 can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $600 and can go as high as $38,000, while this accessory, on average, fetches $2,575.

The Legacy of Diamond in Jewelry Design

Antique diamond rings, diamond tiaras and dazzling vintage diamond earrings are on the wish lists of every lover of fine jewelry. And diamonds and diamond jewelry are primarily associated with storybook engagements and red-carpet grand entrances — indeed, this ultra-cherished gemstone has a dramatic history on its hands.

From “A Diamond Is Forever” to “Diamonds Are a Girl’s Best Friend,” pop culture has ingrained in our minds that diamonds are the most desired, the most lasting and the most valuable gemstone. But what makes the diamond so special? Each stone — whether it’s rubies, sapphires or another stone — is unique and important in its own right. April babies might claim diamonds for themselves, but just about everyone wants this kind of sparkle in their lives!

There are several factors that set diamonds apart from other stones, and these points are important to our gem education.

Diamonds are minerals. They are made up of almost entirely of carbon (carbon comprises 99.95 percent; the remainder consists of various trace elements). Diamonds are the hardest gemstones, ranking number 10 on the Mohs Hardness Scale. Even its name, diamond, is rooted in the Greek adamas, or unconquerable. The only object that can scratch a diamond is another diamond. Diamonds are formed deep within the earth at very high temperatures (1,652–2,372 degrees Fahrenheit at depths between 90 and 120 miles beneath the earth’s surface) and are carried up by volcanic activity. Diamonds are quite rare, according to the Gemological Institute of America, and only 30 percent of all the diamonds mined in the world are gem quality.

In the 1950s, the Gemological Institute of America developed the 4Cs grading system to classify diamonds: clarity, color, cut and carat weight. Not all diamonds are created equal (there are diamonds, and then there are diamonds). The value of the diamond depends on the clarity (flawless diamonds are very rare but a diamond's value decreases if there are many blemishes or inclusions), color (the less color the higher the grade), cut (how the diamond’s facets catch the light, certain cuts of diamonds show off the stone better than others) and carat weight (the bigger, the better).

When you start shopping for a diamond engagement ring, always prioritize the cut, which plays the largest role in the diamond's beauty (taking the time to clean your diamond ring at least every six months or so plays a role in maintaining said beauty). And on 1stDibs, a range of buying guides can be found for those in the market for antique engagement rings, vintage engagement rings or Art Deco engagement rings. 

Shop antique and vintage diamond rings, diamond necklaces and other extraordinary diamond jewelry on 1stDibs.