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Aquamarine 20 carats and Diamond Ring
Located in Firenze, IT
platinum Size 7 Weight: 20 gr
Category

21st Century and Contemporary Italian Fashion Rings

Materials

Aquamarine, Diamond, Platinum

20 Carat Diamond Necklace, circa 1960s
Located in Miami, FL
Stunning Circa 1960s diamond necklace crafted in platinum showcasing 305 mixed cut diamonds
Category

Vintage 1960s Unknown Modern More Necklaces

Materials

Diamond, Platinum

20 Carat Plus Diamond Bracelet, circa 1950s
Located in London, GB
design. It also has a strong geometric feel. These diamonds have a combined weight of approximately 20
Category

Vintage 1950s Unknown Modern Bracelets

Materials

Diamond, Platinum

Art Deco 20 Carat Diamond Bracelet
Located in Miami, FL
diamonds weighing 20 carats total, G color, VS-SI clarity. The diamond encrusted openwork plates showcase
Category

Vintage 1920s Unknown Art Deco More Bracelets

Materials

Diamond, Platinum

Midcentury 20 Carat Diamond Flower Brooch Pin
Located in Miami, FL
Spectacular Circa 1950s diamond flower brooch pin crafted in platinum featuring 171 round brilliant
Category

Vintage 1950s Unknown Modern Brooches

Materials

Diamond, Platinum

French Art Deco 20 Carat Diamond Bracelet
Located in Miami, FL
20cts of mixed cut diamonds, F-G color, VS-SI clarity. This bracelet measures 7 inches in length and 3
Category

Vintage 1920s French Art Deco More Bracelets

Materials

Diamond, Platinum

Platinum Channel Set Diamond Eternity Band
Located in Scottsdale, AZ
Designer: custom Material: platinum Diamond: 20 round brilliant cut = 2.00cttw Color: G Clarity
Category

21st Century and Contemporary Band Rings

Materials

Diamond, Platinum

Platinum 1.29ct Diamond and Emerald Ring
By LB Exclusive
Located in Southampton, PA
measure 17 mm by 20 mm.This Platinum 1.29ct Diamond and 1.53ct Emerald Ring is offered in estate condition
Category

21st Century and Contemporary Band Rings

Materials

Diamond, Emerald, Platinum

Scarselli 20 Carat Fancy Intense Yellow Diamond Ring
By SCARSELLI
Located in New York, NY
This outstanding 20 carat fancy intense yellow Oval Diamond is one of the latest color diamonds
Category

2010s American Contemporary Engagement Rings

Materials

White Diamond, Yellow Diamond, Platinum, 18k Gold

Retro Diamond Feather Yellow Gold Platinum Ring
Located in London, GB
top are set in platinum. There are 20 round cut diamonds for a total carat weight of around 0.70ct
Category

Vintage 1960s French Cocktail Rings

Materials

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

2.2 Carat Diamond and Platinum Eternity Band
Located in Miami, FL
Stunning eternity band crafted in platinum featuring 20 round brilliant cut diamonds weighing
Category

2010s American Modern Wedding Rings

Materials

Diamond, Platinum

Platinum East West Channel Set Baguette Diamond Band
Located in Scottsdale, AZ
Designer: Custom Material: platinum Diamonds: 20 baguette cut = 0.55cttw Color: H Clarity: SI1
Category

21st Century and Contemporary Band Rings

Materials

Diamond, Platinum

Platinum East West Channel Set Baguette Diamond Band
Located in Scottsdale, AZ
Designer: Custom Material: platinum Diamonds: 20 baguette cut = 0.55cttw Color: H Clarity: SI1
Category

21st Century and Contemporary Wedding Rings

Materials

Diamond, Platinum

Platinum 2.00 Carat Natural Round Diamond Eternity Band Ring
Located in Baltimore, MD
Platinum 2.00 Carat Natural Round Diamond Eternity Band Ring Metal: Platinum Weight: 5.19 grams
Category

21st Century and Contemporary American Modern Band Rings

Materials

Diamond, Platinum

French Art Deco Diamond ca. 20 carats Panel Bracelet, ca. 1920s
Located in Idar-Oberstein, DE
. 20 carats of old European cut diamonds (ca. DEF/VS quality) and is made in Platinum. French assay
Category

Vintage 1920s French Art Deco Link Bracelets

Materials

Diamond, Platinum

Platinum 6.60 Carat Natural Round Diamond Circle Pin Brooch
Located in Baltimore, MD
Platinum 6.60 Carat Natural Round Diamond Circle Pin Brooch Metal: Platinum Weight: 9.06 grams
Category

Mid-20th Century Retro Brooches

Materials

Diamond, Platinum

Pink Tourmaline Emerald Diamond Platinum Yellow Gold Ring
Located in Los Angeles, CA
Pink tourmaline emerald and diamond platinum and 20-karat yellow gold ring circa 1990. ABOUT THIS
Category

1990s Contemporary Three-Stone Rings

Materials

Diamond, Emerald, Tourmaline, Yellow Gold, Platinum

Vintage Carre-Cut Diamond 4.00ct Platinum Eternity Band Ring
Located in Miami, FL
or a refined wedding band. Details: Metal: Platinum Diamonds: 20 Carre-Cut (~4.00 ct total, F–G
Category

Vintage 1950s American Retro Wedding Rings

Materials

Diamond, Platinum

37 inces Long Diamond by The Yard Handmade Platinum Necklace
Located in Miami, FL
, set with approx. 20 round diamonds approx. 1.10 carats, H-I Color, Vs2-SI1 Clarity, bezel set. This
Category

Late 20th Century Unknown Art Deco Multi-Strand Necklaces

Materials

Diamond, Platinum

French 1950s 1, 20 Carat Diamonds 18 Karat White Gold Retro Ring
Located in Poitiers, FR
modern brilliant- cut diamonds, spaced every three diamonds of a platinum bar. The ring is made of three
Category

Vintage 1950s French Retro Cocktail Rings

Materials

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

Art Deco Platinum, White Diamond and Cultured Pearl Strand Bracelet
Located in New York, NY
cultured pearls. These two links- also in platinum- offer 20 European cut white diamonds weighing
Category

Vintage 1930s American Art Deco Beaded Bracelets

Materials

Diamond, Cultured Pearl, White Diamond, Platinum

Luminous 3.03 ct Princess Cut Diamond Pave Ring in Platinum - IGI Certified
Located in רמת גן, IL
Luminous 3.03 ct Princess Cut Diamond Pave Ring in Platinum - IGI Certified Featuring 20 princess
Category

2010s Israeli Band Rings

Materials

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

Art Deco Platinum Antique Carré Square Cut Natural Diamond Eternity Band Ring
Located in Baltimore, MD
: Platinum Weight: 3.8 grams Diamonds: 20 antique square cut natural diamonds, approx. 3 CTW F-G VS Width
Category

Early 20th Century Art Deco Band Rings

Materials

Diamond, Platinum

1995 Tiffany Co 18K Yellow Gold Platinum Atlas Diamond Collar Necklace #18595
By Tiffany Co.
Located in Washington Depot, CT
and platinum with 20 sparkling cut diamonds! Approximate total diamond weight: 1.00 Diamond color: G
Category

1990s Contemporary Chain Necklaces

Materials

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

Tiffany Co. Platinum Soleste Half Circle Eternity Band Ring Round Diamond 0.17
By Tiffany Co.
Located in New York, NY
Tiffany & Co. Soleste Wedding/Anniversary Half-Band finely crafted in Platinum with 20 round
Category

21st Century and Contemporary American Modern Wedding Rings

Materials

Diamond, Platinum

Tiffany Co. Platinum Embrace Diamond Full Circle Band Eternity Ring 1.64 Cts
By Tiffany Co.
Located in New York, NY
Tiffany & Co. Embrace band ring finely crafted in platinum with 20 round brilliant cut diamonds set
Category

21st Century and Contemporary American Modern Wedding Rings

Materials

Diamond, Platinum

Long Diamond by The Yard Handmade Platinum Necklace
Located in Miami, FL
, set with approx. 20 round diamonds approx. 1.20 carats, H-I Color, Vs2-SI1 Clarity, bezel set. This
Category

Late 20th Century Unknown Art Deco Multi-Strand Necklaces

Materials

Diamond

6 Carat Emerald Cut Colombian Emerald and 4 Carat Diamond Ring Platinum Two-Tone
Located in New York, NY
6 Carat Emerald Cut Colombian Emerald and 4 Ct Diamond Ring Platinum, Two-Tone A classic, Cocktail
Category

2010s Cocktail Rings

Materials

Diamond, Emerald, Platinum

Bespoke Platinum Eternity Wedding Ring 0.20ct
Located in SYDNEY, NSW
A Bespoke Diamond Wedding Ring. made of Platinum. Featuring 20 Round Brilliant Cut Diamonds bead
Category

21st Century and Contemporary Band Rings

Materials

Diamond, Platinum

Retro Deep Blue 20 Carat Cushion Aquamarine Cocktail Ring
Located in Santa Barbara, CA
fascinating cut allows for even color distribution and fantastic sparkle. Well-placed diamond accents sit just
Category

Vintage 1940s Retro Cocktail Rings

Materials

Aquamarine, Diamond, Platinum

Antique Art Deco Platinum Emerald Cut Aquamarine Engagement Ring
Located in Great Neck, NY
baguettes. Item #R0812 Metal: Platinum Diamonds: Approximately .20 cts Aquamarine: Approximately 2.75
Category

Vintage 1920s Unknown Art Deco Engagement Rings

Materials

Aquamarine, Platinum

Tiffany Co. s Diamond Heart Pendant
By Tiffany Co.
Located in Bethesda, MD
From Tiffany & Co., this is the large platinum heart pendant with 20 diamonds. • Designer: Tiffany
Category

2010s Pendant Necklaces

Materials

Diamond, Platinum

Art Deco Diamond Bracelet
Located in New York, NY
French assay mark for platinum Approx Diamond total weight 20 CT
Category

Vintage 1930s French Art Deco Modern Bracelets

Materials

Diamond, Platinum

Antique Diamond Heart Pendant Brooch
Located in Bethesda, MD
elegance and charm. Metal: Platinum Chain; Handmade 20 inches, platinum Diamond Weight: Approx. 3.25
Category

Vintage 1910s Belle Époque Pendant Necklaces

Materials

Diamond, Platinum

Multi-Color Diamond Cocktail Ring
Located in New Orleans, LA
unique platinum setting amongst 20 pear-shaped diamonds totaling 4.77 carats. Additional pink, yellow
Category

21st Century and Contemporary American Modern Cocktail Rings

Materials

White Diamond, Blue Diamond, Yellow Diamond, Pink Diamond, Platinum

Van Cleef Arpels Symphony Diamond Necklace
By Van Cleef Arpels
Located in New York, NY
platinum. Estimated diamond weight is 20 carats Color: E/F Clarity: VVS The "V" point of the
Category

Vintage 1960s American Drop Necklaces

Materials

Diamond, Platinum

Harry Winston Diamond Brooch
By Harry Winston
Located in New York, NY
Gorgeous Harry Winston Brooch 11 marque & 9 pear shape diamonds set in platinum. Estimated
Category

Late 20th Century American Classical Roman Brooches

Materials

Diamond, Platinum

Estate Tiffany Elsa Peretti Diamonds by the Yard Necklace
By Tiffany Co.
Located in Manhasset, NY
the light and make it dance. Necklace in platinum with 20 round brilliant diamonds. 30 inches long
Category

21st Century and Contemporary Art Deco Multi-Strand Necklaces

Materials

Diamond, Platinum

Vintage Oscar Heyman 5 Carats Diamond Eternity Band Size 5 3/4
By Oscar Heyman
Located in Santa Barbara, CA
platinum band is set with 20 Emerald cut diamonds totaling 5.15 carats total, each hand-selected, matched
Category

20th Century American Art Deco Band Rings

Materials

Diamond, Platinum

Retro 14 Karat Gold Diamond Horseshoe Bracelet with Watch Charm by Verdura
By Verdura
Located in Los Angeles, CA
horseshoe-shaped watch charm, composed of 14k yellow gold and platinum, featuring 20 Round Cut diamonds that
Category

Vintage 1940s American Retro Chain Bracelets

Materials

Diamond, 14k Gold, Yellow Gold, Platinum

AGL Certified Minor 9 Carat Emerald Cut Colombian Emerald and Diamond Ring
Located in New York, NY
# CS 58188 Natural Beryl Emerald Origin Colombia Clarity Enhancement Minor to Moderate Platinum 20 gm
Category

Early 20th Century Cocktail Rings

Materials

Diamond, Emerald, Platinum

1983 Tiffany Co. Paloma Picasso 18 Karat Gold Diamond Scribble Zig Zag Pin
By Paloma Picasso for Tiffany Co.
Located in Washington Depot, CT
"" wide The end is set with 9 round brilliant diamonds in platinum Diamonds are approx. .20 cts and of
Category

20th Century Brooches

Materials

Diamond, Yellow Gold

Tiffany Co. 18 Karat Yellow Gold Paloma Picasso Diamond Scribble Zig Zag Pin
By Paloma Picasso for Tiffany Co.
Located in Washington Depot, CT
" wide The end is set with 9 round brilliant diamonds in platinum Diamonds are approx. .20 cts and of
Category

Vintage 1980s Brooches

Materials

Diamond, 18k Gold

Art Deco 3.10 Carat Diamond Solitaire Ring
Located in Los Angeles, CA
stating that the diamond is H color and SI2 clarity, on a very pretty platinum mount decorated by 20
Tiffany Co. Schlumberger Twenty Stone Hoop Earrings
By Jean Schlumberger for Tiffany Co.
Located in Bethesda, MD
♦ Metal: 18 karat and platinum ♦ 20 diamonds = 1.80 carats ♦ Circa 2019 ♦ Size one inch hoops ♦
Category

2010s American Hoop Earrings

Materials

Diamond, 18k Gold, Platinum

Walton Company Harlequin Black Opal Deco Ring
Located in New York, NY
Australian Black Opal- 23-14mm Bezel set in etched platinum diamond deco ring 20 round old mine
Category

Antique Early 19th Century American Contemporary More Rings

Materials

Diamond, Opal, Platinum

Sapphire and Ruby Gem Set Angel Fish Brooch
Located in Bethesda, MD
sapphires and diamonds. ♦ Metal: Platinum 18 karat ♦ 20 Diamonds = .10 ♦ 14 Vivid Blue Sapphires=1.15 ♦ 16
Category

Vintage 1980s American Brooches

Materials

Diamond, Ruby, Blue Sapphire, 18k Gold

.20 Carat Diamond Platinum Engagement Ring
Located in Hicksville, NY
Ring Size: 6 Metal Type: Platinum [Hallmarked, and Tested] Weight: 3 grams Center Diamond Details
Category

Vintage 1920s Unknown Art Deco Engagement Rings

Materials

White Diamond, Platinum

.20 Carat Total Weight Diamond Platinum Wedding Band
Located in Hicksville, NY
Item Details: Ring Size: 5.5 Metal Type: Platinum [Hallmark and Tested] Weight: 2.0 grams Side
Category

Vintage 1920s Unknown Art Deco Band Rings

Materials

White Diamond, Platinum

.20 Carat Diamond Double-Sided Gold Platinum Cufflinks
Located in Stamford, CT
Diamond center. 4 round full cut Diamonds, approx. total weight .20cts, H, VS2 14k yellow gold & Platinum
Category

Early 20th Century Cufflinks

Materials

Diamond, 14k Gold, Yellow Gold, Platinum, Gold

Estate Certified 20 Carat Star Sapphire Diamond Platinum Ring
Located in Napoli, NA
: Platinum GEM STONE: Sapphire 20 carats, Diamond approx. .80 total carats RING SIZE: US 5 - IT 10 - FR 50
Category

Late 20th Century Cluster Rings

Materials

Diamond, Sapphire, Star Sapphire, Platinum

.20 Carat Diamond Blue Sapphire Halo Platinum Engagement Ring
Located in Stamford, CT
Diamond and sapphire engagement ring. Vintage 1900’s handmade platinum setting with a old mine
Category

Early 20th Century Engagement Rings

Materials

Diamond, Blue Sapphire, Sapphire, Platinum

Antique .17ctw Diamond Engagement Ring, Platinum, Engraved "1-3-20"
Located in McLeansville, NC
sparkling diamonds set in platinum. Engraved with the date "1-3-20", this ring carries historical
Category

Vintage 1970s Engagement Rings

Materials

Diamond, Platinum

Tiffany Co. Platinum True Round Diamond Engagement Ring .20 ct EVS1
By Tiffany Co.
Located in New York, NY
) Metal: Platinum Weight: 2.3 grams Current Retail: $2,000 Diamond Specifications Center Diamond Shape
Category

21st Century and Contemporary American Modern Engagement Rings

Materials

Diamond, White Diamond, Platinum

Tiffany Co. Etoile Ideal Cut Diamond Solitaire Ring in Platinum .20 Carat
By Tiffany Co.
Located in Scottsdale, AZ
: Platinum Natural Diamond: .20 ctw Main Stone Diameter: 3.71 mm Band Width: 3.55 mm Weight: 6.4 grams
Category

21st Century and Contemporary Unknown Modern Engagement Rings

Materials

Diamond, Platinum

Art Deco Platinum 20 Carat Old European Cut Diamonds Natural Emeralds Bracelet
Located in Cape May, NJ
Era: Art Deco Composition: Platinum Primary Stone: Old European Cut Diamond Primary Center
Category

Vintage 1920s Art Deco Tennis Bracelets

Materials

Diamond, 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.