Jabel EGL Certified .30 Carat Round Diamond Platinum Engagement Ring
By Jabel
Located in Stamford, CT
Size 7.75 and sizable 900 Platinum 3.1 grams Tested: Platinum Stamped: 900 Plat 100 Irid Hallmark
Diamond, Platinum
Cathy Waterman Aquamarine Diamond Bracelet 7 Strand Platinum Estate
By Cathy Waterman
Located in Torrance, CA
. Metal & Hallmark: 900 platinum. The bracelet is hallmarked "900PT" and "CW" for Cathy Waterman.
Aquamarine, Diamond, White Diamond, Platinum
Antique Edwardian Diamond Jabot Pin Platinum Brooch Fine Heirloom Jewelry
Located in Torrance, CA
Finely detailed antique Edwardian diamond Jabot pin crafted in 800-900 range platinum (circa 1910s
Diamond, White Diamond, Onyx, Gold, 18k Gold, Yellow Gold, Platinum
Platinum 3.21ctw Large Deep Blue Oval Sapphire Diamond Ballerina Statement Ring
Located in Montclair, NJ
: Solid .900 Platinum Weight: 10.5 Grams Ring Size: 6.0 (Fitted on a finger. We can custom size this ring
Diamond, Sapphire, Platinum
Vintage Platinum Ideal 5.02ctw GIA Round & Baguette Diamond Engagement Ring
Located in Montclair, NJ
: 5.02 (approx.) Material: Solid .900 Platinum Weight: 10.51 Grams Ring Size: 5.5 (We can custom size
Diamond, Platinum
Richard Krementz 18k Gold & Platinum Oval Tanzanite w/ Diamond Channel Ring
Located in Montclair, NJ
Color - VS1/VS2 Clarity - 0.20ctw (approx.) Material: Solid 18k Yellow Gold w/ .900+ Platinum Weight
Diamond, Tanzanite, Gold, 18k Gold, Yellow Gold, Platinum
Solid Platinum 1.32ctw Oval Sapphire & Diamond Flared Beaded Textured Band Ring
Located in Montclair, NJ
Color - 0.12ctw (exact) Total Carat Weight: 1.32 (exact) Material: Solid .900 Platinum Weight: 5.8
Diamond, Sapphire, Platinum
Platinum 2.41ct Marquise Ruby & Baguette Diamond Scalloped 13.9mm Wide Band Ring
Located in Montclair, NJ
Nice Brilliant White Color - 0.80ctw (exact) Total Carat Weight: 2.41 (exact) Material: Solid .900
Diamond, Ruby, Platinum
$5,588Sale Price|20% Off
L 40.5 in
AQUAMARINES 1950 Long Station Necklace In Platinum With 72.98 Ctw Aquamarines
Located in Miami, FL
solid .900/.999 platinum with polished finish and is fitted with a spring ring security lock. Can be
Aquamarine, Platinum
9.33 ctw Mid-Century No Heat Color Change Sapphire & Diamond Platinum Ring
Located in Tysons, VA
natural beauty. Type: Cocktail Ring Era / Style: Mid-Century Metal: Platinum Metal Purity: Plat-900
Diamond, Blue Sapphire, Platinum
Antique 2.38 Carat Diamond and Platinum Solitaire Engagement Ring, Circa 1935
Located in Jesmond, Newcastle Upon Tyne
platinum shank. The interior of the shank is hallmarked with the platinum mark (100 IRID 900 PLAT). This
Diamond, Platinum
Vintage Platinum GIA 2.93ctw Old Emerald Cut & Baguette Diamond Engagement Ring
Located in Montclair, NJ
Weight: 2.93 (approx.) Material: Solid .900+ Platinum Weight: 5.71 Grams Ring Size: 5.5 (Fitted on a
Diamond, Platinum
Classic Style Platinum 3.19ctw Oval Cabochon Opal w/ Diamond Halo Ring
Located in Montclair, NJ
Weight: 3.19 (exact) Material: Solid .900 Platinum (tested) - Stamped PT900 Weight: 7.08 Grams Ring Size
Diamond, Opal, Platinum
Platinum High Quality 3.13ctw Opal Diamond Floral Ballerina Design Cocktail Ring
Located in Montclair, NJ
Weight: 3.13 (exact) Material: Solid .900 Platinum (tested) - Stamped PT900 Weight: 9.64 Grams Ring Size
Diamond, Fire Opal, Platinum
Platinum GIA Graded 5.93ctw Oval Royal Blue Sapphire & Diamond Target Ring
Located in Montclair, NJ
(exact) Total Carat Weight: 5.93 (exact) Material: Solid .900 Platinum (tested) - Stamped P.m900 Weight
Diamond, Sapphire, Platinum
New Platinum GIA 2.58ctw Princess Diamond & Sapphire Solitaire Engagement Ring
Located in Montclair, NJ
(exact) Material: Solid 900+ Platinum Weight: 4.83 Grams Ring Size: 7.25 (Fitted on a finger. We can
Diamond, Sapphire, Platinum
Vintage Platinum 1.30ctw Round Diamond Large Fishtail Pave Set 5 Stone Band Ring
Located in Montclair, NJ
- VS2/SI2 Clarity Total Carat Weight: 1.30 (approx.) Material: Solid .900 Platinum Weight: 7.13 Grams
Diamond, Platinum
Art Deco 0.62ctw Transitional Round Diamond Engagement Ring Platinum Size 4.75
Located in McLeansville, NC
: 900 Platinum Weight: 2.5 Grams Stamps: 10% Irid Plat Face Height: 6.3 mm Rise Above Finger: 4.4 mm
Diamond, Platinum
$23,120Sale Price / set|20% Off
H 3.5 in W 1.5 in D 0.43 in L 17.75 in
VEVER PARIS 1900 Edwardian Enamelled Platinum Necklace With Diamonds & Pearls
Located in Miami, FL
fabulous piece has been masterfully crafted in .900/.999 platinum and mounted with an almond-shaped panel
Diamond, Pearl, White Diamond, Platinum, Enamel
Antique Van Cleef & Arpels VCA Platinum .60ct Diamond Engagement Ring Box Paper
By Van Cleef & Arpels
Located in Montclair, NJ
: Solid .900+ Platinum Weight: 3.13 Grams Ring Size: 7.0 (fitted on a finger. We can custom size this ring
Diamond, Platinum
Fine Natural 5.45ct Australian Black Opal And Diamond Platinum Pendant Necklace
By Gems and Jewels UK
Located in Birmingham, GB
the colour flashes. This top grade opal is set in a bespoke made 900 platinum diamond halo pendant
Diamond, White Diamond, Opal, Black Opal, Platinum
Vintage Platinum 1.54ctw Oval Cabochon Cut Star Ruby & Diamond Classy Ring
Located in Montclair, NJ
.900 Platinum Weight: 7.23 Grams Ring Size: 6.5 (Fitted on a finger. We can custom size this ring
Diamond, Ruby, Platinum
Blue Nile Platinum 0.60ctw Channel Set Square Step Diamond Wedding Band Ring
By Blue Nile
Located in Montclair, NJ
/VS1 Clarity Total Carat Weight: 0.60 (approx.) Material: Solid .900+ Platinum Weight: 4.80 Grams Ring
Diamond, Platinum
NEW Platinum GIA 1.54ctw Elongated Radiant Cut Diamond Solitaire Engagement Ring
Located in Montclair, NJ
Carat Weight: 1.54 (exact) Material: Solid .900+ Platinum Weight: 3.84 Grams Ring Size: 6.5 (Fitted on
Diamond, Platinum
New Platinum 8.80ctw Fiery F VS2 Round Brilliant Diamond Line Tennis Bracelet
Located in Montclair, NJ
- VS2 Clarity - 8.80ctw (exact) Material: Solid .900+ Platinum Weight: 27.64 Grams Chain Type: Line
Diamond, Platinum
GIA Certified 10.03 Carat Emerald Cut Diamond Platinum Ring
By Gad & Co.
Located in Miami, FL
Certificate Number: #2155926250 Ring Details: Ring Type: 3-Stone Ring Metal: Platinum (PT 900) Ring Weight
Diamond, White Diamond, Platinum
GIA Certified 10.99 Carat Oval Sapphire Diamond Platinum Engagement Ring
Located in Stamford, CT
diamonds, H-I VS SI approx. .27cts Size 6.5 and sizable Platinum Stamped: PT 900 12.3 grams Width at top
Diamond, Sapphire, Blue Sapphire, Platinum
Art Deco Platinum 1.25ctw Diamond Green Stones Unique Shield Dinner Ring
Located in Montclair, NJ
: Solid .900+ Platinum Weight: 4.42 Grams Ring Size: 6.5 ( fitted on finger, please contact us prior to
Diamond, Platinum
Antique Art Deco Platinum .36ctw Old European Diamond Engagement Ring w/ Accents
Located in Montclair, NJ
(approx.) Total Carat Weight: 0.36 (approx.) Material: Solid .900 Platinum Weight: 2.19 Grams Ring Size
White Diamond, Platinum
9.29ct Vivid Blue Emerald Cut Aquamarine And Diamond Platinum Cocktail Ring
Located in Birmingham, GB
a beautiful modern 900 platinum ring with 6 round brilliant cut diamond accents of G/H colour SI1
Aquamarine, Diamond, White Diamond, Platinum
Platinum 1.55ct Oval Bezel Sapphire Solitaire Brushed Finish Low Profile Ring
Located in Montclair, NJ
(Exact-certified) ** See Certification Details Below for Complete Info ** Material: Solid .900+ Platinum
Sapphire, Platinum
$8,750
H 0.95 in W 0.55 in L 17 in
Platinum GIA 6.83ctw No Heat Deep Blue Sapphire & Diamond Pendant Chain Necklace
Located in Montclair, NJ
- 1.20ct (exact) Total Carat Weight: 6.83 (exact) Material: Solid Platinum .850 Platinum Chain with .900
Diamond, Sapphire, Platinum
Platinum GIA 22.91ctw Spessartine Spessartite Garnet & Diamond Split Shank Ring
Located in Montclair, NJ
Clarity - 0.89ctw (exact) Total Carat Weight: 22.91 (approx.) Material: Solid .900+ Platinum Weight: 14.5
Diamond, Garnet, Platinum
6.43 Carat Purple Pink Natural Sapphire Diamond Platinum Engagement Ring
Located in Stamford, CT
– SI1 Size 6 and sizeable 900 Platinum Tested: Platinum Stamped: Pt 900 6.4 grams Width at top: 12.2mm
Diamond, Pink Sapphire, Sapphire, Platinum
Briolette 0.60ct Diamond Fringe Earrings Estate Platinum Drops Fine Jewelry
Located in Torrance, CA
Elegant pair of contemporary estate briolette diamond drop earrings crafted in 900 platinum. 12
Diamond, White Diamond, Platinum
New Platinum GIA 1.19ct Cushion No Heat Ceylon Sapphire Solitaire Brushed Ring
Located in Montclair, NJ
: Solid .900+ Platinum - stamped PLAT Weight: 4.66 Grams Ring Size: 6.5 (Fitted on a finger, please
Sapphire, Platinum
Vintage Platinum 2.63ctw Pear Round & Baguette Diamond 4 Leaf Clover Flower Ring
Located in Montclair, NJ
.) Material: Solid .900+ Platinum (stamped plat) Weight: 6.51 Grams Ring Size: 9.0 ( fitted on finger, please
Diamond, Platinum
Vintage Platinum GIA 1.02ctw Oval Green Purple Brazil Alexandrite Diamond Ring
Located in Montclair, NJ
) Material: Solid .900+ Platinum (tested) - Stamped PT900 Weight: 4.59 Grams Ring Size: 5.5 (We can custom
Alexandrite, Diamond, Platinum
$22,360Sale Price|20% Off
CARTIER London 1960 Gipsy Ring In Platinum With Burmese Ruby & Diamonds
By Cartier
Located in Miami, FL
vintage ring has been masterfully hand crafted in solid .900/.999 platinum with a delicate and thin
Diamond, Ruby, White Diamond, Platinum
Solid Platinum GIA 13.17ctw Burma Oval Lavender Jade & Diamond Statement Ring
Located in Montclair, NJ
) Total Carat Weight: 13.17 (exact. stamped) Material: Solid .900 Platinum (testes) & Stamped PT900
Diamond, Jade, Platinum
$21,200Sale Price|20% Off
H 0.51 in W 0.51 in D 0.39 in L 17 in
CARTIER Art-Deco 1938 Certified Necklace In Platinum With Diamonds & Sapphires
By Cartier
Located in Miami, FL
has been masterfully crafted as a station with a cluster in solid .900/.999 platinum with high
Diamond, Sapphire, White Diamond, Blue Sapphire, Platinum
$2,998
H 0.55 in W 2 in L 16.5 in
Vintage 14k Gold Platinum Diamond Chain w/ Opal Ruby Swan Charm Pendant Necklace
Located in Montclair, NJ
Platinum Center w/ Solid 14k White Gold Snake Link Charm: Solid .900 Platinum Total Weight: 22.66 Grams
Diamond, Opal, Ruby, 14k Gold, Platinum
Classic Platinum GIA 1.5ctw Octagonal Colombian Emerald w/ Diamond Timeless Ring
Located in Montclair, NJ
Weight: 1.5 (exact) Material: Solid .900+ Platinum (tested) - Stamped PT900 Weight: 5.85 Grams Ring Size
Diamond, Emerald, Platinum
Platinum GIA 5.05ct Cushion Oval Bezel Sapphire Solitaire Low Brushed Ring
Located in Montclair, NJ
(Exact-certified) ** See Certification Details Below for Complete Info ** Material: Solid .900+ Platinum
Sapphire, Platinum
Diamond Leaf Eternity Ring Platinum Band Vintage Fine Jewelry Estate
Located in Torrance, CA
Finely detailed vintage diamond eternity ring, crafted in 900 platinum. A total of 49 round
Diamond, White Diamond, Platinum
Platinum High Quality 1.12ctw Alternating Ruby & Diamond Low Profile Band Ring
Located in Montclair, NJ
Color - VS1/VS2 Clarity - 0.42ctw (approx.) Total Carat Weight: 1.12 (approx.) Material: Solid .900
Diamond, Ruby, Platinum
Vintage Platinum High Quality 4.35ctw Opal & Diamond Halo Classic Ring
Located in Montclair, NJ
Weight: 4.35 (approx.) Material: Solid .900+ Platinum w/ Yellow Gold Prongs Weight: 5.58 Grams Ring Size
Diamond, Opal, Gold, Yellow Gold, Platinum
$15,160Sale Price / set|20% Off
H 2.36 in W 1.58 in L 20 in
BELLE EPOQUE 1910 Antique Convertible Platinum Necklace Brooch With Diamonds
Located in Miami, FL
converted into a brooch, with multiples parts made up in solid .900/.999 platinum and 18 karats yellow gold
Diamond, White Diamond, Gold, Yellow Gold, Platinum
$9,588Sale Price / set|20% Off
H 1.26 in L 1.18 in
FRENCH 1938 Art-Deco Platinum Clips Earrings With 27.62 Ctw Diamonds &
Located in Miami, FL
has been designed as a left and right in solid .900/.999 platinum and embellished with forty-two
Diamond, Turquoise, White Diamond, Platinum
$15,995
D 2.5 in L 1.44 in
Fred Leighton 4.42 Carat Pear Cut Briolette Diamond Platinum Dangle Earrings
By Fred Leighton
Located in Stamford, CT
grams Tested: Platinum Stamped: PT 900 Hallmark: Fred Leighton
Diamond, Platinum
Platinum GIA 2.56ctw No Heat Emerald Cut Sapphire & Pave Diamond Ring
Located in Montclair, NJ
.) Total Carat Weight: 2.56 (approx.) Material: Solid .900+ Platinum Weight: 7.30 Grams Ring Size: 6.5
Diamond, Sapphire, Platinum
EGL Certified .51 Carat Edwardian Old European Diamond Platinum Cocktail Ring
Located in Stamford, CT
.08cts, H, VS Size 6.5 and sizable 900 Platinum Tested: 900 Platinum Stamped: 900 Plat 10% Irid Hallmark
Diamond, Platinum
$11,985
H 0.95 in W 0.91 in
Vintage Platinum 6.4ct Pear Marquise Diamond Large Snowflake Spray Stud Earrings
Located in Montclair, NJ
.) Total Carat Weight: 6.40 (approx.) Material: Solid .900 Platinum Weight: 9.71 Grams Backing: Posts w
Diamond, Platinum
Vintage Tiffany & Co. Platinum GIA 1.52ct Oval Diamond Solitaire Engagement Ring
By Tiffany & Co.
Located in Montclair, NJ
: 1.52 (exact) Material: Solid .900+ Platinum Weight: 4.93 Grams Ring Size: 9.5 (We can custom size this
Diamond, Platinum
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
Aquamarine, Diamond, White Diamond, Platinum
$6,985
H 1 in W 0.64 in L 17.5 in
Platinum GIA 5.89ct Large Oval Sapphire w/ Dual Halo Diamond Pendant Necklace
Located in Montclair, NJ
) Total Carat Weight: 5.89 (exact) Material: Solid .850 Platinum Chain with .900 Platinum Pendant Weight
Diamond, Sapphire, Platinum
$10,430
W 0.48 in D 0.4 in L 1.19 in
COLORWONDER Tanzanite Rhodochrosite Pendant w. Chain 10 / 2 ct AAA+ Platinum
Located in Viena, Viena
oval-faceted rhodochrosite in rare purity and colour AAA+, approx. 1.84 ct, pendant with chain in 900
White Diamond, Spinel, Tanzanite, Platinum
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.
Ancient Egyptians referred to the vibrant stone as the “gem of the sun.”
There are many ways to showcase a diamond, from traditional prongs to a smooth, streamlined bezel. Here’s everything you need to consider.
The vintage bombé ring is bursting with color and timeless style.
Zircon is a magnificent and underrated natural gemstone that has been worn and adored for centuries.
Givers of fine gems enjoy surprise more than receivers, and women more than men. Find out what else our survey of 3,000 Americans revealed.
If diamonds don’t seem right, what about a magnificent sapphire, ruby or emerald?
Accounting for just 1 percent of all diamonds, these marvels of nature are exceedingly rare and gorgeously complex.
Learn about these antique jewelry styles, then choose a design that speaks to you.