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12 Carats Solitaire Diamond

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TYPE IIA Golconda GIA Certified 12 Carat Oval Diamond Platinum Solitaire Ring
By Antinori Fine Jewels
Located in Rome, IT
diamond, certified by GIA, and boasting an impressive 12 carats. Crafted to perfection and set in
Category

2010s Contemporary Solitaire Rings

Materials

Diamond, Platinum

Antique 1.18 Carat Diamond and Yellow Gold Solitaire Ring
Located in Jesmond, Newcastle Upon Tyne
A stunning, fine and impressive 1.18 carat diamond, 12 karat yellow gold and platinum set
Category

Vintage 1920s Unknown Solitaire Rings

Materials

Diamond, Yellow Gold

IGI Certified 1.01 Carat Solitaire Diamond Ring
Located in Palermo, IT
Certified 1,01 ct Solitaire Diamond Ring colour E ,Si2 round cut.Italian manifacture 1960 ca. 18kt
Category

Vintage 1950s Italian Modern Solitaire Rings

Diamond Solitaire Ring
By Vitale 1913
Located in Monte-Carlo, MC
beautiful ring is created from natural white diamonds in total of 0.17 Carat and 12 diamonds on the shank
Category

2010s Italian Contemporary Solitaire Rings

Materials

Diamond, White Diamond, 18k Gold, White Gold

18 carat yellow gold solitaire round brillant cut diamond ring
Located in Monte-Carlo, MC
18 carat yellow gold solitaire ring designed with 1 round brillant cut diamond weighing 0.34 carat
Category

2010s Solitaire Rings

Materials

Diamond, Yellow Gold

IGI Certified 3.00 Carat Natural Diamond 18k Gold Solitaire Ring
Located in Massafra, IT
[Custom Size Available] Diamond Weight : 4.20 Carats [3 Carats Center + 12 pcs x 0.10 Cts Side] Diamond
Category

21st Century and Contemporary Italian Contemporary Solitaire Rings

Materials

Diamond, 18k Gold, White Gold

Oval 12 Carat Treated Ruby and 1 Carat Diamond 14 Karat Yellow Gold Ring
Located in New York, NY
16 X11 Oval Cut Approximately 12.28 Carat Treated Ruby 14 Karat Yellow Gold Ring Size 6
Category

2010s Solitaire Rings

Materials

Diamond, Ruby, 14k Gold, Yellow Gold

1.65 Carat Padparadscha Sapphire Solitaire & Baguette Diamond 18 Karat Gold Ring
Located in METAIRIE, LA
Containing 1 Central Bezel set 1.65 carat Oval cut Natural Padparadscha Sapphire solitaire at 7.7mm
Category

Vintage 1970s Solitaire Rings

Materials

Diamond, Sapphire, Yellow Gold, 18k Gold

Alex Jona 9.9 Carat Tanzanite White Diamond Gold Solitaire Cocktail Ring
By Alex Jona
Located in Torino, IT
, centering a 9.92 carat square cut Tanzanite, embraced on both sides by two rows of white diamonds, E color
Category

21st Century and Contemporary Italian Solitaire Rings

Materials

Tanzanite, White Diamond, 18k Gold, White Gold, Gold

3 Carat Round Cut Natural Diamond Solitaire Mens Ring in 14K Gold Two Tone
By Gad & Co.
Located in Miami, FL
design. Boasting a 3-carat diamond, showcasing a warm M-N color, and held securely with a 4-prong setting
Category

2010s North American Modern Solitaire Rings

Materials

Diamond, Yellow Gold, 14k Gold

1 Carat Ruby and Black Diamond Solitaire Ring Set in 18 Karat Yellow Gold
Located in London, GB
centre complemented with 12 shimmering shoulder black diamonds. Made in 18k yellow gold with the blossom
Category

2010s British Contemporary Solitaire Rings

Materials

Black Diamond, Ruby, 18k Gold, Yellow Gold

18ct Gold Diamond Solitaire Ring circa 1920s
Located in London, GB
diameter 1.9cm / .75 inches. The setting depth is 3mm / .12 inch. The old cut diamond is .48 - .52 carats
Category

Early 20th Century Solitaire Rings

Materials

Diamond, 18k Gold

Alex Jona Emerald White Diamond Platinum Solitaire Ring
By Alex Jona
Located in Torino, IT
3.83 carats round cut emerald. One carat in total of white diamonds, E color, VVS1 clarity, are set on
Category

21st Century and Contemporary Italian Contemporary Solitaire Rings

Materials

White Diamond, Emerald, Platinum

Alex Jona White Diamond Yellow Gold Solitaire Ring
By Alex Jona
Located in Torino, IT
round brilliant cut weighing 0.42 carat white diamond, I Color, VVS2 Clarity, see Gemological
Category

2010s Italian Contemporary Solitaire Rings

Materials

White Diamond, 18k Gold, Yellow Gold

Art Deco Mine Diamond White Gold Ring Solitaire
Located in Firenze, FI
gorgeous central 0.90 Carat Old Mine Diamond . The central Diamond surrounded by 12 smaller Old Mine Cut
Category

Early 20th Century French Art Deco Solitaire Rings

Materials

Diamond, White Gold

Alex Jona Aquamarine White Diamond White Gold Solitaire Ring
By Alex Jona
Located in Torino, IT
carat emerald cut Aquamarine. The shoulders are set with 22 white diamonds, weighing 0.14 carats in
Category

2010s Italian Contemporary Solitaire Rings

Materials

White Diamond, Diamond, Aquamarine, White Gold, 18k Gold, Gold

Alex Jona Emerald White Diamond White Gold Solitaire Ring
By Alex Jona
Located in Torino, IT
carat emerald cut Emerald. The shoulders are set with 24 white diamonds, weighing 0.20 carats in total
Category

2010s Italian Contemporary Solitaire Rings

Materials

Emerald, White Diamond, White Gold, 18k Gold

Natural Diamond 0.06CT 18Karat White Gold Baguette Cut Solitaire Ring
Located in Antwerpen, BE
Behold the 18kt White Gold Natural Diamond Solitaire Baguette Ring, a masterpiece of grace and
Category

2010s Belgian Modern Solitaire Rings

Materials

Diamond, White Gold

Natural Diamond 0.06CT 18Karat Rose Gold Baguette Cut Solitaire Ring
Located in Antwerpen, BE
Behold the 18kt Rose Gold Natural Diamond Solitaire Baguette Ring, a masterpiece of grace and
Category

2010s Belgian Modern Solitaire Rings

Materials

Diamond, Rose Gold

Natural Diamond 0.06CT 18Karat Yellow Gold Baguette Cut Solitaire Ring
Located in Antwerpen, BE
Behold the 18kt Yellow Gold Natural Diamond Solitaire Baguette Ring, a masterpiece of grace and
Category

2010s Belgian Modern Solitaire Rings

Materials

Diamond, Yellow Gold

Delightful Cabochon Ruby and Diamond Solitaire Ring in 18 Karat
Located in Wailea, HI
Delightful Cabochon Ruby and Diamond Solitaire Ring in 18k One Cabochon Ruby weighing 1.12 carats
Category

Late 20th Century American Modern Solitaire Rings

Materials

White Diamond, Ruby

Alex Jona White White Diamond Yellow Gold Solitaire Band Ring
By Alex Jona
Located in Torino, IT
centering a 0.38 carats, F Color, VVS2 Clarity brilliant round cut white diamond. Ring Size: 12 EU/6 US
Category

2010s Italian Contemporary Solitaire Rings

Materials

White Diamond, 18k Gold, Yellow Gold

2.01 ct HRD Classic Solitaire Diamond Ring in 18k White Gold
Located in KAATSHEUVEL, NL
HRD (Antwerp diamond high council) certified 2.01 carat H-VS2 round diamond engagement ring. Round
Category

21st Century and Contemporary Italian Contemporary Solitaire Rings

Materials

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

Antique Platinum 1.08ctw GIA European Diamond Solitaire Sapphire Engagement Ring
Located in Montclair, NJ
Diamonds - Old Single Cut - Pave Set - F/G Color - VS1/VS2 Clarity - 0.16ctw (approx.) -- Total Carat
Category

Early 20th Century Unknown Art Deco Solitaire Rings

Materials

Diamond, Sapphire, Platinum

Amethyst and Diamond 10 Karat Yellow Gold Ring, Solitaire Prong Setting
Located in Milford, DE
/4 Hallmarks: 10K Amethyst size: 8 x 6 mm Diamond (12) total carat weight approx .23 ct
Category

Late 20th Century Solitaire Rings

Materials

Amethyst, Diamond, 10k Gold

Georgios Collections 18 Karat Yellow Gold Solitaire Blue and White Diamond Ring
By Georgios Collections Inc
Located in Astoria, NY
features a beautiful 0.24 Carat Brilliant cut Diamond accompanied by 2 Brilliant cut Diamonds radiated and
Category

21st Century and Contemporary Greek Byzantine Solitaire Rings

Materials

Blue Diamond, White Diamond, Diamond, Yellow Gold, 18k Gold, Gold

18KT White Gold Natural Diamonds The Radiant Emerald Cut Solitaire Ring
Located in Antwerpen, BE
Embodying celestial elegance, this exquisite Emerald Cut Solitaire Ring in 18K White Gold boasts a
Category

2010s European Modern Solitaire Rings

Materials

Diamond, Emerald, White Gold

Alex Jona Blue Sapphire White Diamond 18 Karat Yellow Gold Solitaire Ring
By Alex Jona
Located in Torino, IT
sapphire weighing 0.55 carats. The shoulders are set with 18 white diamonds, F color, VVS1 clarity weighing
Category

2010s Italian Solitaire Rings

Materials

Blue Sapphire, White Diamond, Diamond, 18k Gold, Yellow Gold

Vintage 12 Ct Natural Carved Emerald & 1.5 Ct Diamond Ring 18 Kt Yellow Gold
Located in New York, NY
approximately 12 ct with beautiful color and clarity. Accompanied by brilliant cut diamonds approximately 1.5 ct
Category

Early 2000s Solitaire Rings

Materials

Diamond, Emerald, 14k Gold, Yellow Gold

Diamond and Ruby Art Deco Style Solitaire Ring in 18K White Gold
Located in Bangkok, TH
Diamond and ruby ring showcases one round cut diamond weighing approximately 0.4 carat, having H
Category

21st Century and Contemporary Thai Art Deco Solitaire Rings

Materials

Ruby, Diamond, White Gold, 18k Gold

Alex Jona Pink Sapphire White Diamond 18 Karat Rose Gold Solitaire Ring
By Alex Jona
Located in Torino, IT
sapphire weighing 0.69 carats. The shoulders are set with 18 white diamonds, F color, VVS1 clarity
Category

2010s Italian Solitaire Rings

Materials

White Diamond, Pink Sapphire, 18k Gold, Rose Gold

12 Ct Natural Marquis Ruby & 0.75 Ct Diamond 18 Kt White Gold Ball Ring Size 6
Located in New York, NY
12 Ct Natural Marquis Ruby & 0.75 Ct Diamond 18 Kt White Gold Ball Ring Size 6 Introducing our
Category

2010s Solitaire Rings

Materials

Diamond, Ruby, Gold, 18k Gold, White Gold

Elegant 0.72 Carat Round Diamond Ring
Located in רמת גן, IL
carat cut: Round Brilliant color: D clarity: VVS2 cut grade: EX 12 diamond side stones of total: 0.1
Category

2010s Israeli Solitaire Rings

Materials

Diamond, 18k Gold, White Gold

Luxurious 18 Karat White Gold Ring with Large Emerald and 12 Diamonds
Located in Berlin, DE
Luxurious 18 Karat white gold ring with large emerald and 12 diamonds The diamonds are of very
Category

20th Century Solitaire Rings

Materials

Diamond, White Diamond, Emerald, 18k Gold, White Gold

Antique Victorian 9K Gold Round Opal Solitaire w/ Old Cut Diamond Halo Ring
Located in Montclair, NJ
Nice Green, Violet and Orange Play of Colors- 5.8mm (approx.) (12) Natural Genuine Diamonds - Old Mine
Category

Antique 1890s Victorian Solitaire Rings

Materials

Diamond, Opal, 9k Gold, Yellow Gold

Emerald Cut London Blue Topaz and Diamond Solitaire Ring in 14K Yellow Gold
Located in Bangkok, TH
9 mm. Number: 1 Weight: 9.00 Carat (approx. total weight) Shoulder Gemstones Type: Diamond Shape
Category

21st Century and Contemporary Thai Art Deco Solitaire Rings

Materials

Blue Topaz, Topaz, Diamond, Yellow Gold, 14k Gold

GIA Certified 3.50 Carat Royal Blue Sapphire Round Cut Diamond Ring
By Antinori Fine Jewels
Located in Rome, IT
Prong-set Royal Gem framed by 12 Round diamonds and diamonds on the shank weighing approx. 1.60ct, F-G
Category

2010s Italian Modern Solitaire Rings

Materials

Diamond, Blue Sapphire

London Blue Topaz Ring Diamond Halo 3.89 Carats
Located in Laguna Niguel, CA
= 3.80 Carat 12 Diamonds = 0.09 Carats Metal: Rhodium Plated Sterling Silver Ring Size: 7* US *It can be
Category

21st Century and Contemporary Contemporary Solitaire Rings

Materials

Diamond, White Diamond, Topaz, Blue Topaz, Silver, Sterling Silver

18 Carat Gold Hoop Ring with Diamonds
Located in Amsterdam, NL
An 18 carat yellow gold ring with a white gold loop set with 19 diamonds (app. 0.76 carat) set in
Category

Early 2000s European Solitaire Rings

Materials

Diamond, Gold, 18k Gold

Natural Diamond Ring 0.11 Carats 18 Karat Rose Gold Engagement Ring
Located in Antwerpen, BE
Rose Gold Weight:2.85 Grams Gemstone: 3 Natural Diamonds Shape: Baguette/ Round Total Carat Weight
Category

2010s Belgian Modern Solitaire Rings

Materials

Diamond, 18k Gold, Rose Gold

Natural Diamond Ring 0.11 Carats 18 Karat Yellow Gold Engagement Ring
Located in Antwerpen, BE
Yellow Gold Weight:2.85 Grams Gemstone: 3 Natural Diamonds Shape: Baguette/ Round Total Carat Weight
Category

2010s Belgian Modern Solitaire Rings

Materials

Diamond, 18k Gold, Yellow Gold

Natural Diamond Ring 0.11 Carats 18 Karat White Gold Engagement Ring
Located in Antwerpen, BE
White Gold Weight:2.78 Grams Gemstone: 3Natural Diamonds Shape: Baguette/ Round Total Carat Weight: 0.12
Category

2010s Belgian Modern Solitaire Rings

Materials

Diamond, 18k Gold, White Gold

Natural 8 Carat Emerald Cut Zambian Emerald & Diamond Ring in Platinum, Estate
Located in New York, NY
Natural 8 Carat Emerald Cut Zambian Emerald & Diamond Ring in Platinum, Estate A classic design
Category

2010s Solitaire Rings

Materials

Diamond, Emerald, Platinum

Exquisite 2.53-carat Heart Brilliant Natural Diamond Ring
Located in רמת גן, IL
This exquisite ring features a dazzling 2.53-carat heart brilliant natural diamond as its
Category

2010s Israeli Solitaire Rings

Materials

Diamond, White Gold

14K Yellow Gold Organic Round Salt and Pepper Diamond Ring 'Center: 1.28 Carat'
Located in San Francisco, CA
This Delicate design features a row of twelve (12) round diamonds micro-prong set in a hidden halo
Category

21st Century and Contemporary American Solitaire Rings

Materials

Diamond, 14k Gold, Yellow Gold

1.7 carat oval ring
Located in Dublin, IE
Stone Type: diamond Specifications (Band) Weight: 1.7 DWT (2.64 grams) Primary Stone Count: 12-stone
Category

2010s Irish Modern Solitaire Rings

Materials

Diamond, 14k Gold, White Gold

1.7 carat oval ring
1.7 carat oval ring
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Alex Jona Aquamarine Rose & Yellow Gold Solitaire Ring
By Alex Jona
Located in Torino, IT
centering 1.05 carats of aquamarine. Ring shoulders are in rose & yellow gold. Ring Size: 12 EU/6.5 US
Category

2010s Italian Contemporary Solitaire Rings

Materials

Aquamarine, 18k Gold, Rose Gold, Yellow Gold

GIA Certified 3.48 Carat Natural Color Change Alexandrite Ruby Diamond Ring
Located in New York, NY
natural diamonds. G color vs2 clarity. 14 karat white gold 12 grams Deck of ring measures 15 x 13 mm
Category

2010s American Solitaire Rings

Materials

Diamond, Ruby, Alexandrite, 14k Gold, White Gold

Alex Jona Aquamarine Blue Sapphire White Gold Solitaire Ring
By Alex Jona
Located in Torino, IT
Alex Jona design collection, hand crafted in Italy, 18k white gold solitaire ring, centering a 1.03
Category

2010s Italian Contemporary Solitaire Rings

Materials

Blue Sapphire, Aquamarine, Gold, White Gold, 18k Gold

Alex Jona Aquamarine Blue Sapphire White Gold Solitaire Ring
By Alex Jona
Located in Torino, IT
Alex Jona design collection, hand crafted in Italy, 18k white gold solitaire ring, centering a 1.61
Category

2010s Italian Contemporary Solitaire Rings

Materials

Blue Sapphire, Aquamarine, White Gold, 18k Gold, Gold

GIA Certified Blue 7.2 Carat Aquamarine Diamond 18 Karat Gold Ring
Located in Wallkill, NY
cut, Surrounded by 12 Diamonds Approximately 1/2 Carat, 3 on each angle. Ring is a size 8-3/4 and can
Category

Vintage 1950s Unknown Solitaire Rings

Materials

Aquamarine, Diamond, 18k Gold, Gold, Yellow Gold

3 carat pear shaped engagement ring.
Located in Dublin, IE
A beautiful custom made to order 3 carat diamond engagement ring. Two tone in colour white gold and
Category

2010s Irish Modern Solitaire Rings

Materials

White Diamond, White Gold, Yellow Gold

Large 43 Carat Yellow Topaz Emerald Step Cut and Diamond Ring in 14k Yellow Gold
Located in Honolulu, HI
Diamond Count: 12 single cut diamonds Diamond Weight: 0.35 carats Diamond Color: I-J Diamond Clarity
Category

21st Century and Contemporary Unknown Modern Solitaire Rings

Materials

Diamond, Topaz, 14k Gold, Yellow Gold

7.20 Ct. Natural Aquamarine Vintage Style Filigree Solitaire Ring in 14K Gold
Located in Bangkok, TH
: 7.20 carat. (approx.) Total Gram Weight: 4.84 g. (approx.)*Pictures have been enlarged to show details
Category

21st Century and Contemporary Thai Edwardian Solitaire Rings

Materials

Aquamarine, 14k Gold, White Gold

GIA Platinum Diamonds and Sapphire Ring
Located in New York, NY
: approx. 1.26 carat and 12 cabochon sapphires total weight approx. 1.80ct. In the center: 3.03 carat round
Category

21st Century and Contemporary American Artist Solitaire Rings

Materials

Diamond, Sapphire, Platinum

Diamond Ring 18K White Gold Engagement Old European Cut 2.05 TDW
By Estate Jewelry
Located in East Brunswick, NJ
cut diamond is .75 carat by calculation of VS1 clarity and K color. 12 princess cut diamonds total
Category

20th Century Solitaire Rings

Materials

Diamond, 18k Gold, White Gold

2.26ct GIA Certified Natural Purple Pink Sapphire Diamonds Ring 14kt
Located in New York, NY
& Transparent 1.20ct. natural Diamonds. Rounds Full cuts G-color Vs-2 clarity. 14kt. white gold Ring
Category

2010s American Solitaire Rings

Materials

Diamond, Sapphire, 14k Gold, White Gold

12.49 Carat Australian Black Opal Certified "Lightening Ridge" Mine 18K Ring
By Malpani Jewels
Located in Hung Hom, HK
jewellery. A wonderful cocktail of colors form on the body of this certified 12 carat black opal from
Category

2010s Hong Kong Art Nouveau Solitaire Rings

Materials

White Diamond, Opal, Black Opal, 18k Gold

Stunning 0.60ct Moonstone with Side Diamonds Ring
Located in רמת גן, IL
brilliant natural diamonds, collectively weighing 0.10 carats, and 12 taper-shaped diamonds totaling 0.12
Category

2010s Singaporean Solitaire Rings

Materials

Diamond, Moonstone, White Gold

14K Yellow Gold Men's Diamond Ring 0.35ct
Located in Laguna Beach, CA
Men's 14k yellow ring with diamond. Stamped 14k and weighs 12.8 grams. The diamond is a round
Category

Mid-20th Century Solitaire Rings

Materials

Diamond, 14k Gold, Yellow Gold

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12 Carats Solitaire Diamond For Sale on 1stDibs

Find the exact 12 carats solitaire diamond you’re shopping for in the variety available on 1stDibs. Every item for sale was constructed with extraordinary care, often using Gold, Platinum and 14k Gold. You can easily find a 16 antique edition and 34 modern creations to choose from as well. Making the right choice when shopping for a 12 carats solitaire diamond may mean carefully reviewing examples of this item dating from different eras — you can find an early iteration of this piece from the 20th Century and a newer version made as recently as the 21st Century, both of which have proven very popular over the years. As it relates to this specific piece, our collection includes designs that are universally popular, but .5 Carat and 1 Carat carat weights, specifically, are sought with frequency. Creating a 12 carats solitaire diamond has been a part of the legacy of many jewelers, but those produced by Tiffany & Co., Antinori Fine Jewels and Boucheron are consistently popular. See these pages for a round cut iteration of this accessory, while there are also oval cut cut and cushion cut cut versions available here, too. If you’re browsing our inventory for a 12 carats solitaire diamond, you’ll find that many are available today for women, but there are still pieces to choose from for unisex and men.

How Much is a 12 Carats Solitaire Diamond?

On average, a 12 carats solitaire diamond at 1stDibs sells for $9,100, while they’re typically $350 on the low end and $1,275,000 for the highest priced versions of this item.

Finding the Right Rings for You

Antique and vintage rings have long held a special place in the hearts of fine jewelry lovers all over the world.

No matter their origin or specific characteristics, rings are timeless, versatile accessories. They’ve carried deep meaning since at least the Middle Ages, when diamond rings symbolized strength and other kinds of rings were worn to signify romantic feelings or to denote an affiliation with a religious order. Rings have also forever been emblematic of eternity.

Over time, rings have frequently taken the form of serpents, which have long been associated with eternal life, health and renewal. Italian luxury jewelry house Bulgari has become famous for its widely loved Serpenti motif, for example, and its Serpenti ring, like the other accessories in the collection, began as an homage to jewelry of the Roman and Hellenistic eras. The serpent is now a popular motif in fine jewelry. Jewelry devotees have long pined for rings adorned with reptiles, thanks to antique Victorian rings — well, specifically, Queen Victoria’s illustrious engagement ring, which took the form of a gold snake set with rubies, diamonds and an emerald (her birthstone). Designs for Victorian-era engagement rings often featured repoussé work and chasing, in which patterns are hammered into the metal.

Engagement rings, which are reliably intimidating to shop for, are still widely recognized as symbols of love and commitment. 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

The most collectible antique engagement rings and vintage engagement rings are those from the Victorian, Edwardian and Art Deco eras. Named for the monarchies of the four King Georges, who in succession ruled England starting in 1714 (plus King William’s reign), antique Georgian rings, be they engagement rings or otherwise, are also coveted by collectors. Pearls, along with colored gemstones like garnets, rubies and sapphires, were widely used in Georgian jewelry. The late-1700s paste jewelry was a predecessor to what we now call fashion or costume jewelry

The Art Nouveau movement (1880–1910) brought with it rings inspired by the natural world. Antique Art Nouveau rings might feature depictions of winged insects and fauna as well as women, who were simultaneously eroticized and romanticized, frequently with long flowing hair. Art Deco jewelry, on the other hand, which originated during the 1920s and ’30s, is by and large “white jewelry.” White metals, primarily platinum, were favored over yellow gold in the design of antique Art Deco rings and other accessories as well as geometric motifs, with women drawn to the era’s dazzling cocktail rings in particular.

Whether you’re hunting down a chunky classic for a Prohibition-themed cocktail party or seeking a clean contemporary design to complement your casual ensemble, find an exquisite collection of antique, new and vintage rings on 1stDibs.

Questions About 12 Carats Solitaire Diamond
  • 1stDibs ExpertFebruary 22, 2021
    The size of a 12 carat diamond is dependent on diamond cut. A 12 carat round diamond is roughly 15 mm in size.