Cartier 0.49 Carat Diamond Engagement Ring
By Cartier
Located in New York, NY
diamond accents. The ring is signed Cartier and stamped Pt 950 48 and is numbered. It is currently size 4
Diamond, Platinum
Tiffany & Co. Paloma Picasso Platinum Baroque Keshi Pearl Pendant 16" Necklace
By Tiffany & Co.
Located in Montclair, NJ
Width: 12.8mm (0.50") (approx.) Thickness: 8.3mm Hallmark: Tiffany & co. - Paloma Picasso - PT 950
Pearl, Platinum
Tiffany Diamond Etoile Heart Charm Pendant
By Tiffany & Co.
Located in London, GB
& Co’ ‘750’ 'PT 950' Diamonds: Approx. 0.15 carats, Colour: G-H, Clarity: VS Box: Plain gift box
Diamond, 18k Gold
Platinum Diamond Ring w Tanzanite 4.00ct, .50tdw
Located in Laguna Beach, CA
Ladies tanazanite and diamond ring with platinum setting. Stamped Pt 950 and weighs 6.9 grams. The
Diamond, Tanzanite, Platinum
GIA 1.99 Carat Old Mine Brilliant Cut Diamond Bezel Stud Platinum Earrings
Located in Stamford, CT
Platinum 950 Tested: Platinum Stamped: Pt 950 2.7 grams Top to bottom: 6.71mm or .27 inch Width: 6.55mm or
Diamond, Platinum
2.08ct H VVS1 Square Emerald Cut Diamond Platinum Engagement Ring
By Tobi Gem Setting
Located in London, GB
platinum shank. Stamped PT 950. UK finger size 'L''. HRD Certificate no: 13012896001
Diamond, Platinum
2.12ctw Round Diamond Solitaire Engagement Ring 18k Gold Platinum Size 6.5 GIA
Located in McLeansville, NC
- SI2 GIA - 5231247523 Metal: 18k Yellow Gold, 950 Platinum Weight: 3.7 Grams Stamps: 750 Pt 950 Face
Diamond, 18k Gold, Yellow Gold, Platinum
AGL Certified Natural 1.41 Carat Green Sapphire Diamond Platinum Engagement Ring
Located in Stamford, CT
.34cts, F, VS Size 6+ and sizable Platinum Stamped: Pt 950 Height at top: 6.7mm Width at top: 7.3mm Width
Diamond, Sapphire, Green Sapphire, Platinum
Harry Winston Diamond Brooch
By Harry Winston
Located in New York, NY
31.38ct. (Color: D-F, Clarity: IFVS2, 22 stones are GIA Certified) all set in platinum. Stamped HW, PT
Diamond, Platinum
Oval Signet Ring - 950 Platinum with Monogram Engraving
By Victor Mayer
Located in Pforzheim, DE
Victor Mayer Signet Ring, PT 950 Platinum, Oval, approx. 14.0 * 11.0 mm with Monogram-Engraving
Platinum
2.30 Carat Diamond Platinum Swirl Earrings
Located in Stamford, CT
Stamped: PT 950 15.8 grams Top to bottom: 22mm or .85 Inch Width: 22mm or .85 Inch Depth or thickness
Diamond, Platinum
Peter Suchy 1.50 Carat Canary Yellow Diamond Gold Platinum Pendant Necklace
By Peter Suchy
Located in Stamford, CT
Stamped PT 950. 6.7 grams.
Diamond, Yellow Diamond, 18k Gold, Platinum, Gold, Yellow Gold
Peter Suchy 4.95 Carat Diamond Platinum Eternity Wedding Band Ring
By Peter Suchy
Located in Stamford, CT
: Platinum Stamped: PT 950 8.7 grams Width at top: 4.6mm Height at top: 3.5mm Width at bottom: 4.6mm
Diamond, Platinum
EGL Certified .40 Carat Semi Bezel Channel Set Diamond Engagement Ring
Located in Stamford, CT
sizable Platinum Stamped: FD PT 950 6.1 grams Width at top: 6.8mm Height at top: 5.9mm Width at bottom
Diamond, Platinum
Peter Suchy GIA Certified 1.60 Carat Star Ruby Diamond Platinum Dangle Earrings
By Peter Suchy
Located in Stamford, CT
Stamped: PT 950 2.8 grams Top to bottom: 13.5mm or .5 Inch Width: 5.7mm or 3/16 Inch Depth or thickness
Diamond, Ruby, Platinum
$10,600
Coral Cabochon Diamond ring
Located in New York, US
- Stamped pt 950 for platinum. - Coral Cabochon measuring approximately 19.75 x 19.83mm ( depth non
Coral, Diamond, 18k Gold
Tiffany & Co. Diamond Key Pendant Necklace
By Tiffany & Co.
Located in London, GB
& Co.’ ‘PT 950' Box: Plain Gift Box
Diamond, Platinum
Cartier Destinee Cushion 1.15 cts H VS1 Halo Engagement Ring in Platinum
By Cartier
Located in San Diego, CA
. number: N4746100 Certification: GIA 2215029799 Metal: Pt 950 Platinum Size: 6.25 sizable Measurements
Diamond, Platinum
Tiffany & Co. Platinum Diamond Bracelet
By Tiffany & Co.
Located in Flushing, NY
Tiffany & Co. Platinum Diamond Bracelet Marked: TIFFANY & Co PT 950 1997 Approximate
Diamond, Platinum
Platinum Vintage Diamond Fringed Knot Cluster Earrings, App. 1.88 TCW
Located in Fairfield, CT
have no posts, and omega style backs. Marks: PT 950 Dimensions: 1" long x 9/16" wide Weight: 9.7 gross
Diamond, White Diamond, Platinum
Tiffany & Co Etoile 18K Gold & Platinum Diamond Earrings
By Tiffany & Co.
Located in Flushing, NY
Tiffany & Co Etoile 18K Gold & Platinum Diamond Earrings Marked: TIFFANY & Co 750 PT 950
Diamond, Gold, 18k Gold, Platinum
Platinum Cabochon Sapphire and Diamond Dome Ring
Located in Great Neck Plaza, NY
conversation piece. Signed and stamped "PT 950" on the inner shank. Featured in ISSUE Magazine in November 2025.
Diamond, Sapphire, Platinum
Tiffany & Co. 1.71 Carat F IF Diamond Platinum Ring
By Tiffany & Co.
Located in New York, NY
0.72ct F VS The setting is PT/950. The ring is a size 6, not sizable The ring weighs 8.4 grams. The ring
Diamond, White Diamond, Platinum
Fancy Yellow Cushion Diamond 3-Row 1.88 Carat Orianne Designer Platinum Ring
Located in San Diego, CA
Carats Total Color & Clarity: H - I color, SI1 - SI2 clarity Hallmark: Orianne PT 950, D 0.51ct
Diamond, Platinum
Peter Suchy EGL Certified 1.60 Carat Round Diamond Platinum Pendant Necklace
By Peter Suchy
Located in Stamford, CT
# 055190370D Platinum Stamped: PT 950 2.7 grams Top to bottom: 3.8mm or .54 Inches Width: 7.6mm or .30 Inches
Diamond, Platinum
EGL Certified 3.35 Carat Old European Diamond Platinum Stud Earrings
Located in Stamford, CT
European diamond, I-J SI approx. 1.72cts Platinum Stamped: PT 950 3.5 grams Top to bottom: 7.9mm or .31
Diamond, Platinum
Tiffany & Co 0.42ct Lucida Diamond (G/IF) Solitaire 950 Platinum Engagement Ring
By Tiffany & Co.
Located in MELBOURNE, AU
& weight of diamond: "D.0.42ct" It's stamped PT 950 & hallmarked Total item's weight: 4.00gr. Ring's
Diamond, Platinum
1.65 Carat Diamond Platinum Art Deco Pendant Necklace
Located in Stamford, CT
Platinum Stamped: PT 950 10.0 grams Top to bottom: 34.4mm or 1 1/3 Inch Width: 17.7mm or 11/16 Inch Depth
Diamond, Platinum
Tiffany & Co Channel Set Platinum Diamond Engagement Ring Round 1.03 ct F VVS2
By Tiffany & Co.
Located in San Diego, CA
Diamond Certificate: 31137748/N09240084 Metal: Platinum PT 950 Size: 6 - sizable TCW: 1.36 tcw Main
Diamond, Platinum
2.02 Carat Green Tourmaline Diamond Platinum Dangle Earrings
Located in Stamford, CT
, approx. .03ct each, total weight .18cts, G-H, VS Platinum Tested: Platinum Stamped: Pt 950 Top to bottom
Diamond, Tourmaline, Platinum
Van Cleef & Arpels Diamond Cluster Platinum Earrings
By Van Cleef & Arpels
Located in Greenwich, CT
Cleef & Arpels, PT 950 (Platinum) NY. 55368. A delicate balance between design and the simplicity of the
Diamond, White Diamond, Platinum
Art Deco Ring Platinum Hand Made Natural Green Sapphire 1.08 carat and Diamond
Located in MADRID, ES
size: 7 3/4 US/ EU 16.5 /56.50/18 mm Contrasts and Mark: Pt 950
Diamond, Green Sapphire, Platinum
Peter Suchy GIA 1.53 Carat Diamond Halo Octagonal Platinum Engagement Ring
By Peter Suchy
Located in Stamford, CT
Stamped: PT 950 Hallmark: T 8.2 grams Width at top: 12.33mm Height at top: 7.06mm Width at Bottom: 2.25mm
Diamond, Platinum
$7,200Sale Price|20% Off
Tiffany & Co. 18k Yellow Brooch Diamond
By Tiffany & Co.
Located in Chicago, IL
" & "PT 950", this brooch comes accompanied by a T&Co Box, ensuring its authenticity and elegance.
Diamond, White Diamond, 18k Gold, Yellow Gold
GIA Certified 1.30 Carat Burma Ruby Diamond Ring in Platinum
Located in Hong Kong, HK
placed to accentuate the ruby's regal presence. These stunning stones are set in a band of PT 950
Diamond, Ruby, Platinum
Tiffany & Co. Platinum and Diamond Engagement Ring
Located in Washington Depot, CT
Diamond clarity: VS1 Ring Size: 5.5 Weight: 2.3 dwt. / 3.6 gr. Hallmark: TIFFANY & CO PT 950
Diamond, Platinum
Tiffany & Co Novo Platinum Diamond Engagement Ring
Located in Washington Depot, CT
Diamond clarity: VS1 Ring Size: 6 Weight: 2.5 dwt. / 4.0 gr. Hallmark: TIFFANY & CO PT 950
Diamond, Platinum
Peter Suchy GIA Certified .99 Carat Black Diamond Platinum Halo Pendant Necklace
By Peter Suchy
Located in Stamford, CT
33 round brilliant cut diamonds, F-G VS approx. .16cts Platinum Stamped: PT 950 5 grams Chain: 18
Black Diamond, Diamond, Platinum
GIA .88 Carat Cornflower Blue Sapphire Diamond Halo Platinum Pendant Necklace
Located in Stamford, CT
: pt 950 Chain: 16 inches Chain width: 1mm cable chain Center section width: 8.5mm Top to bottom: 6.7mm
Blue Sapphire, Diamond, Sapphire, Platinum
GIA Certified 13.78 Carat Yellow Sapphire Diamond Platinum Pendant Necklace
Located in Stamford, CT
Platinum Chain Platinum Stamped: Chan PT 950 8.6 Grams Top to Bottom: 38.0mm or 1 ¾ Inches Width: 13.29mm
Diamond, Sapphire, Yellow Sapphire, Platinum
$7,998Sale Price|25% Off
Tiffany & Co Platinum Diamond Engagement Ring 0.85ct
By Tiffany & Co.
Located in SYDNEY, NSW
Cut: Round Brilliant Cut Weight: 5.4 grams Engravings/Markings: Signed TIFFANY & Co PT 950 D
Diamond, Platinum
Tiffany & Co Elsa Peretti Diamond Stacked Band Rings, Platinum, Ring Size 5
By Elsa Peretti for Tiffany & Co.
Located in McLeansville, NC
: Peretti Tiffany & Co PT 950 A Couple Of Things to Note: * This is a vintage item and may show signs of
Diamond, Platinum
Tiffany & Co. Platinum & Diamond Jazz Band Ring Size 5.75 #24321
By Tiffany & Co.
Located in Washington Depot, CT
- .62 ct. Diamond color: G Diamond clarity: VS Weight: 3.3 g./ 2.1 dwt. Hallmark: T&CO. PT 950
Diamond, Platinum
Platinum Infinity Set Diamond Pendant Necklace #17782
Located in Washington Depot, CT
8.4mm X 4.1mm Weight: 1.82 dwt/ 2.84 g Hallmark: PT 950 ZEZ Very good condition, professionally
Diamond, Platinum
Kwait Platinum 18K White Gold Marquis Diamond Dangle Earrings #17044
By Kwait
Located in Washington Depot, CT
mm x 7 mm Weight: 2.5 dwt. / 4.0 gr. Stamped: PT 950 KWAIT Very good condition, professionally
White Diamond, Platinum
Ladies Vintage Watch Bracelet in Platinum with Diamonds
By Unbranded
Located in New York, NY
and special occasions. Material: PT 950 Condition: Mint Movement Manual Winding Diamonds: 5.5ct
Diamond, Platinum
Necklace in 18 Karat Gold, Platinum and Diamonds and 1.5 Carat Yellow Diamond
Located in Paris, FR
Necklace in 18 Carat white Gold, PT 950 Platinum and diamonds holding an Important Yellow Cushion
Diamond, Yellow Diamond, 18k Gold, White Gold, Yellow Gold, Platinum
Vintage Platinum 2.03ct Diamond Solitaire Ring
Located in New York, NY
Hallmark: PT 950 Item #: BR-1664-072925-07
Diamond, Platinum
$1,170Sale Price|40% Off
Platinum Pink Kunzite Ring
By Christopher Bilton
Located in 徳島市, JP
really glows! Stamped Pt 950 inside. Recently completed brand new ring. 950 platinum from the UK Made
Kunzite, Platinum
Birks Platinum GIA Certified 0.72ct H VS2 Sleek Engagement Ring
By Birks
Located in New York, NY
: 8.1 x 5.7 x 5.8mm Ring Size: 5.5 Hallmark: BIRKS PT 950 0.72 BR-1532-030625-20
Diamond, Platinum
Peter Suchy GIA 1.23 Carat Diamond Sapphire Halo Platinum Engagement Ring
By Peter Suchy
Located in Stamford, CT
Size 6.5 and sizable 950 Platinum Tested: Platinum Stamped: Pt 950 Hallmark: T 6.1 grams Width at top
Diamond, Sapphire, Blue Sapphire, Platinum
Natalie K GIA 3.33 Carat Octagonal Purple Sapphire Diamond Platinum Ring
By Natalie K
Located in Stamford, CT
, VS Size 6.75 and sizable Platinum Stamped: Pt 950 NK D 0.38 0.16 Width at top: 8.6mm Height
Diamond, Sapphire, Purple Sapphire, Platinum
GIA Certified 1.84 Carat Sapphire Diamond Platinum Art Deco Dangle Earrings
Located in Stamford, CT
. .28cts Platinum Stamped: PT 950 6.4 grams Top to bottom: 22.1mm or 7/8 Inch Width: 8.6mm or 1/3 Inch
Diamond, Sapphire, Platinum
5.86 Carat Green Tourmaline Diamond Halo Platinum Gold Cocktail Ring
Located in Stamford, CT
Stamped: PT 950 18k Hallmark: Infinity symbol
Diamond, Pink Diamond, Tourmaline, 18k Gold, Rose Gold, Platinum, Gold
Platinum 1.65ct Diamond Heart Necklace MFG16-012826
By LB Exclusive
Located in Southampton, PA
diamonds when turned. Crafted in platinum and stamped Pt 950, this necklace carries a reassuring weight of
Diamond, Platinum
18k White Gold & Platinum Emerald and Diamond Earrings
Located in New York, NY
: 12.5 Grams Stone: Diamond, Emerald 1.58tcw Measurements: 17.9 x 13.3 x 7mm Hallmark: E 1.58, 750 PT 950
Diamond, Emerald, 18k Gold, White Gold, Platinum
Cellini Plat Fancy Colored 1.43Ct Pink 1.34Ct Yellow 1.53Ct Grey Diamond Ring
By Cellini
Located in New York, NY
=0.64 carats Size 6 Stamped PT 950 All facts our based on our 30+ years of gemological expertise
Diamond, Yellow Diamond, Pink Diamond, 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.