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20 Carat Marquise and Pear Shape Diamond Cluster Stud Earrings in Platinum 1960
Located in New York, NY
1960's Platinum And Diamond earrings weight of platinum 24.6 Gm 15 diamonds in each earring
Category

2010s Stud Earrings

Materials

Diamond, Platinum

Handmade 40″ long Diamond Platinum Chain necklace
Located in Miami, FL
, set with approx. 20 round diamonds approx. 1.30 carats, H-I Color, Vs2 – SI2 Clarity, bezel set. This
Category

Late 20th Century Unknown Art Deco Chain Necklaces

Materials

Diamond, Platinum

Bespoke 20 Carat Riviera Diamond Necklace with Peridot, Emerald and Rubies
By Antinori Fine Jewels
Located in Chicago, IL
• Metal: Platinum • Total carat weight: Approximately 20 cts • Diamond color: F • Diamond clarity: VS
Category

2010s Chain Necklaces

Materials

Diamond, White Diamond, Emerald, Peridot, Ruby, Platinum

Antique Art Deco Platinum Single Cut Diamond Wedding Band
Located in Great Neck, NY
think marquise pattern. Item #R0694 Metal: Platinum Diamond: Approximately .20 cts Color: H
Category

Vintage 1920s Art Deco Wedding Rings

Materials

Diamond, Platinum

Antique Madonna Mother of Pearl Diamond Platinum Pendant Necklace
Located in Stamford, CT
diamonds. Newer platinum 20 inch chain. 1 oval white mother of pearl carving, 38mm x 30mm 33 rose cut
Category

Early 20th Century Pendant Necklaces

Materials

Diamond, Pearl, Platinum

Vintage Tiffany Co Elsa Peretti Platinum and Diamond Teardrop Dangle Earrings
By Elsa Peretti for Tiffany Co.
Located in Washington Depot, CT
elegant platinum. Approximate total diamond weight: 20 ct. Diamond color: G Diamond clarity: VVS1
Category

20th Century Dangle Earrings

Materials

Diamond, Platinum

Tiffany Co. Platinum Necklace and Cross Pendant with Bezel Set Diamonds
By Tiffany Co.
Located in Palm Beach, FL
A ladies platinum necklace with platinum and diamond cross and 20 inch platinum cable link neck
Category

Late 20th Century American Pendant Necklaces

Materials

Diamond, White Diamond, Platinum

Raymond Yard 20 carat Star Sapphire Ring
By Raymond C. Yard
Located in Miami, FL
Captivating handmade platinum ring by Raymond Yard featuring an alluring 20 carat star cabochon
Category

Vintage 1930s American Art Deco Cocktail Rings

Materials

Diamond, Sapphire, Platinum

Retro Platinum 2.21 Total Carat Diamonds by the Yard Link Chain Necklace
Located in Narberth, PA
stunning piece is crafted in platinum and comprised of 20 elegant diamond links, which alternate with
Category

Vintage 1940s Unknown Retro Chain Necklaces

Materials

Diamond, Platinum

STATIONS CHAIN 1930 Art Deco Long Necklace In Platinum With 6.05 Ctw In Diamonds
Located in Miami, FL
chain is excellent. Beside the little normal wear, there is no damage to the platinum. The 20 diamonds
Category

Vintage 1930s American Art Deco Chain Necklaces

Materials

Diamond, White Diamond, Platinum

GRS Certified 20 Carat MINOR OIL Zambian Heart Shape Emerald Pendant
By Antinori Fine Jewels
Located in Chicago, IL
Stunning GRS Certified 20 carat heart-shaped natural green emerald gemstone. Sourced from the
Category

2010s Italian Modern Choker Necklaces

Materials

Diamond, White Diamond, Emerald, Platinum

GIA Certified 6.22 Ct Emerald Cut Natural Diamond Wedding Eternity Band
By Simon Ardem
Located in New York, NY
Diamond Eternity Band set in Platinum. 20 Emerald cut diamonds = 6.22 ct. Color: D(9 stones)-E(5
Category

21st Century and Contemporary American Contemporary Band Rings

Materials

Diamond, Emerald, Platinum

David Webb Emerald and Diamond Flower Brooch
By David Webb
Located in Bethesda, MD
18 karat gold brooch features 20 platinum set diamonds weighing approximately 1.40 carats and 15
Category

Vintage 1960s American Brooches

Materials

Diamond, Emerald, 18k Gold

Gorgeous 20 Carats Diamonds Platinum Necklace
Located in Lambertville, NJ
A platinum necklace set with 19.78ctw of GH/VS1-SI1 diamonds. The necklace is 16 1/2" long and 12m
Category

20th Century Unknown More Necklaces

Materials

Diamond, Platinum

1950s 20 Carat Aquamarine Diamond Platinum Ring
Located in Lambertville, NJ
Platinum ring, set with an approximately 20 carat aquamarine, surrounded with 030ctw in diamonds
Category

20th Century More Rings

Materials

Aquamarine, Diamond, Platinum

Midcentury 20 Carat Aquamarine Diamond Platinum Ring
Located in Lambertville, NJ
Platinum mid century cocktail ring, set with a 20.16ct aquamarine, surrounded with 0.37ctw in
Category

20th Century More Rings

Materials

Aquamarine, Diamond, Platinum

Magnificent 20 Carats Diamonds Platinum Day Night Drop Earrings
Located in Lambertville, NJ
A pair of platinum day / night diamond drop earrings, featuring approximately 20 carats in VS1-SI1
Category

Late 20th Century Unknown More Earrings

Materials

Diamond, 18k Gold, Platinum

20 Carat Star Ruby and Diamond Ring in Platinum
Located in San Francisco, CA
gemstone is nestled inside a platinum and diamond mounting composed of small marquise diamonds and rolling
Category

Early 20th Century Art Deco Cocktail Rings

Materials

Ruby, Diamond, Platinum

Art Deco .20 Carat Diamond Emerald Platinum Engagement Ring
Located in Tampa, FL
A stunning antique engagement ring or fashion ring featuring a center diamond that is .20ct. apx
Category

Vintage 1920s Unknown Art Deco Engagement Rings

Materials

Diamond, Emerald, Platinum

Art Deco .20 Carats Diamonds Sapphire Gold Platinum Fashion Engagement Ring
Located in Tampa, FL
A gorgeous antique engagement ring or antique fashion ring crafted in platinum and 18K white gold
Category

Vintage 1920s Unknown Art Deco Engagement Rings

Materials

Diamond, Sapphire, Platinum

Art Deco .20 Carat Diamond Sapphire Platinum Belais Engagement Ring
By Belais
Located in Tampa, FL
.20ct. apx. European cut diamond with exceptional VS1 clarity and equally exceptional F color. The
Category

Vintage 1920s Unknown Art Deco Engagement Rings

Materials

Diamond, Sapphire, 18k Gold, White Gold

20 carats of Diamonds Cluster Earrings
Located in Chestnut Hill, MA
Platinum cluster earrings consisting of approximately 20 carats of pear shape diamonds having a
Category

21st Century and Contemporary Unknown Contemporary Lever-Back Earrings

Materials

Diamond, Platinum

Antique 1920s Platinum Ring 1:20 Carat Aquamarine Art Deco Stepped Shoulders
Located in Preston, Lancashire
This Art Deco platinum features a round cut 1.20 carats aquamarine, secured with four V corners is
Category

Early 20th Century British Art Deco Engagement Rings

Materials

Aquamarine, Diamond, Platinum

Antique 20 ct. Amethyst and Diamond Cocktail Ring
Located in New York, NY
setting, fine milgraine, and 48 accent diamonds, she's just begging to be worn. Gemstone and Diamond
Category

Vintage 1910s Cocktail Rings

Materials

Amethyst, Diamond, 14k Gold, Platinum

Art Deco 20 Ctw. Old European Cut Diamond Bracelet
Located in New York, NY
European cut diamonds weighing 20 carats total make up this sparkler. Each diamond is set in a hand
Category

Early 20th Century Unknown Art Deco Tennis Bracelets

Materials

Diamond, Platinum

Stunning Oscar Heyman Diamond Gold Platinum Band Ring
By Oscar Heyman
Located in Lambertville, NJ
platinum with 20 round brilliant cut diamonds of the highest grade totaling approx 2.0cts. Each side is
Category

21st Century and Contemporary American Wedding Rings

Materials

Diamond, 18k Gold, Platinum

2.11 Carat Brilliant Cut Diamond Full Eternity Ring in Platinum
Located in Yorkshire, West Yorkshire
Dare to dazzle with this alluring contemporary eternity ring modelled in Platinum. It features 20
Category

21st Century and Contemporary British Art Deco Band Rings

Materials

Diamond, Platinum

Art Deco Pendant Necklace with 20+ Carat Diamonds Can Be Worn as 3 Bracelets
Located in Antwerp, BE
believe this to be of Belgian origin. Style: Art Deco Period: ca. 1920 Material: platinum Diamond(s
Category

Vintage 1920s Belgian Art Deco Pendant Necklaces

Materials

Diamond, White Diamond, Platinum

Art Deco Exceptionnal 20 Carats Emerald Cabochon Ring. L.F.G Certified
Located in Beziers, FR
Art Deco Exceptionnal 20 Carats Emerald Cabochon Ring. L.F.G certified (Laboratoire Français de
Category

Vintage 1930s French Art Deco More Rings

Materials

Diamond, Emerald, Platinum

Elegant 20 Carat Mixed Shapes Diamonds Platinum Cluster Earrings
Located in New York, NY
Elegant pair of Earring made from Platinum and has different shapes of Diamonds creating The Royal
Category

21st Century and Contemporary American Contemporary Clip-on Earrings

Materials

Diamond, White Diamond, Platinum

1970s H.Stern 20 Carat Amethyst Diamond Gold Platinum Ring
By H. Stern
Located in Agoura Hills, CA
full cut diamonds set in platinum on either side. Approximate total diamond weight: 0.22ct Color: F-G
Category

Vintage 1970s Brazilian Cocktail Rings

Materials

Amethyst, Diamond, 18k Gold, Platinum

Classic Edwardian Natural Pearl Diamond Gold Platinum $20 Gold Piece Pendant
Located in Palm Beach, FL
topped and gold back. The coin is surrounded with rose cut diamonds and natural pearls. This $20- gold
Category

Antique Early 1900s Edwardian Pendant Necklaces

Materials

Diamond, Natural Pearl, 18k Gold, Platinum

Art Deco Diamond Link Lattice Bracelet 20 Carat
Located in Lakewood, NJ
A very pretty and unique diamond in platinum bracelet from the Art Deco period. The bracelet
Category

Early 20th Century American Art Deco Tennis Bracelets

Materials

Diamond, Platinum

Exquisite French Floral Rose Cut Diamond Bracelet in 20 Karat and Platinum
Located in Boston, MA
gold and platinum. Featuring beautiful hand crafted flower plaques connected by platinum topped diamond
Category

Antique Late 19th Century French Link Bracelets

Materials

Diamond, Yellow Gold, Platinum

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Platinum 20 Diamonds For Sale on 1stDibs

There is a broad range of platinum 20 diamonds for sale on 1stDibs. Frequently made of Platinum, Gold and 18k Gold, these items were constructed with great care. Our collection of these items for sale includes 11013 vintage editions and 305 modern creations to choose from as well. Our collection is diverse and broad-ranging, and pieces in stock date back to the 18th Century while others were produced as recently as the 21st Century. Pieces in our collection of platinum 20 diamonds made by Art Deco jewelers — as well as those associated with Edwardian — are very popular. Tiffany Co., David Webb and Cartier each produced beautiful examples of these items that are worth considering. Today, if you’re looking for round cut platinum 20 diamonds and are unable to find the perfect match, our selection also includes old european cut and emerald cut alternatives. When shopping our range of platinum 20 diamonds, you’ll find that there are less available pieces for men today than there are for women.

How Much are Platinum 20 Diamonds?

Prices for platinum 20 diamonds can differ depending upon size, time period and other attributes — at 1stDibs, these accessories begin at $1 and can go as high as $6,500,000, while platinum 20 diamonds, on average, fetch $8,461.

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 ringsvintage engagement rings or Art Deco engagement rings

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