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GIA Diamond Engagement Ring 1.35ct
By GIA
Located in SYDNEY, NSW
: 750. Set with a Single Triangle, brilliant cut Diamond, colour G, and clarity SI1. Weighing 1.00 ct
Category

21st Century and Contemporary Engagement Rings

Materials

Diamond, Yellow Gold

GIA 1.01-ct. Diamond & 18k Gold Antique Ring
Located in San Francisco, CA
-cut diamond, GIA graded I color and VVS2 clarity, surrounded by a halo of 12 old mine-cut diamonds
Category

Early 20th Century Engagement Rings

Materials

Diamond, 18k Gold

GIA 17 Ct Sugar Loaf Cabochon Colombian Emerald & 13 Ct Diamond Necklace 18KWG
Located in New York, NY
Colombian Emerald & 12 Carat Diamond Necklace 18KWG approximately 13 Carats of Diamond Necklace, Estate
Category

Early 2000s More Necklaces

Materials

Diamond, Emerald, 18k Gold

GIA Rare 4.24 Ct. Fine Colombian Emerald & Diamond Platinum Ring
Located in Honolulu, HI
Rare 4.24 ct. Fine Colombian Emerald & Diamond Platinum Ring With GIA Report. This stunning ring
Category

Late 20th Century Colombian Cocktail Rings

Materials

Diamond, Emerald, Platinum

Art Deco GIA Certified 1.22 ct. Diamond Engagement Ring K SI1
Located in New York, NY
. Diamond Details: Primary Stone: 1.22 ct. Old European Color/Clarity: K / SI1 Accent Stones: (12) single
Category

Mid-20th Century Unknown Art Deco Engagement Rings

Materials

Diamond, Platinum

GIA Certified 12 Carat Emerald Cut Fancy Yellow Diamond Trillion side Ring
By Antinori Fine Jewels
Located in Rome, IT
12 ct emerald Cut Diamond Halo Engagement Ring in 18K White Gold and Platinum
Category

2010s Italian Modern Engagement Rings

Materials

Diamond, White Diamond, Yellow Diamond, Emerald

Harakh GIA Certified 8.75 CT Colorless Diamond 18 KT Raindrop Dangling Earrings
By Harakh
Located in New York, NY
These simple yet sophisticated diamond earrings are studded with 12 round, 10 baguette and 20 pear
Category

2010s Indian Modern Dangle Earrings

Materials

Diamond, 18k Gold

GIA Emerald Cut White Diamond 0.50 ct. Each Cross Pendant Necklace in 18K
Located in Los Angeles, CA
Gorgeous 6.03 ct. IJ VVS1-VS2 white diamond emerald cuts. Total of 12 stones, 0.50 ct. each
Category

21st Century and Contemporary Pendant Necklaces

Materials

White Diamond, 18k Gold

GIA Emerald Cut White Diamond 0.50 ct. Each Cross Pendant Necklace in 18K
Located in Los Angeles, CA
Gorgeous 6.08 ct. IJ VVS1-VS2 white diamond emerald cuts. Total of 12 stones, 0.50 ct. each
Category

21st Century and Contemporary Pendant Necklaces

Materials

White Diamond, 18k Gold

GIA 10.85 ct. White Diamond Round Eternity Band Ring in 18K White Gold
Located in Los Angeles, CA
Gorgeous 10.85 ct. white diamond rounds JK color VS1-SI1 clarity. Total of 12 stones. Handmade in
Category

21st Century and Contemporary Band Rings

Materials

White Diamond, White Gold

8.51 Ct Colombian Emerald 18 Karat Gold Diamond GIA Certified Cocktail Ring
By Tsarina Jewels
Located in Bangkok, TH
accented by leaf shaped Rubellite and 12 White Diamonds totaling 0.17 ct. Combination of colors and shapes
Category

2010s Thai Fashion Rings

Materials

Diamond, Emerald, Rubelite, Gold, 18k Gold

1960S GIA 62.25 Ct Cabochon Emerald Diamond 18K Gold Tassel Lariat Rope Necklace
Located in Miami, FL
Gold accents, its center is enhanced by (12) round-cut, prong-set, Diamonds weighing approximately 0.55
Category

Vintage 1960s Pendant Necklaces

Materials

Diamond, Emerald, 18k Gold

Dazzling 18k White Gold 3 Stone Ring with 2.57 ct Natural Diamonds GIA Cert
Located in רמת גן, IL
total: 0.6 ct. cut: cushion color: Fancy Yellow clarity: VVS2 cut grade: VG Side stones: 12 diamonds
Category

2010s Israeli Cluster Rings

Materials

Diamond, 18k Gold, White Gold

Stunning 18 kt. White Gold Ring with 1.71 ct Total Natural Diamonds - GIA Cert
Located in רמת גן, IL
Elegant 1.01 Carat F VS1 Square Emerald Cut Diamond Ring with 0.7 Carat Side Stones This stunning
Category

2010s Israeli Three-Stone Rings

Materials

Diamond, 18k Gold, White Gold

Natural Ruby Diamond Halo Ring in 18k Yellow Gold, With GIA Gem Report. 2.42 CT.
Located in Honolulu, HI
by a diamond halo of 12 round brilliant diamonds. The beautiful bright red Ruby is full of life and
Category

Late 20th Century Unknown Cocktail Rings

Materials

Diamond, Ruby, 18k Gold

Unheated Blue Sapphire Ring GIA Certified, 5.04 ct 18kt White Gold
Located in Tampa, FL
, violetish blue color GIA vB 5/4. Set with 8 round brilliant cut diamonds at 0.62 cts & 8 baguette cut
Category

2010s Sri Lankan Modern Engagement Rings

Materials

Blue Sapphire, Diamond, 18k Gold, White Gold

Edwardian 1.13 Ct. Old European Engagement Ring GIA K VS1 in Platinum
Located in New York, NY
: (12) Single Cut diamonds Accent Stone Weight 0.20 ct. Accent Color Clarity: J-K / SI Ring
Category

Early 20th Century Unknown Edwardian Engagement Rings

Materials

Diamond, Platinum

GIA Certified Red Ruby Diamond Platinum Ring
By Antinori Fine Jewels
Located in Rome, IT
Natural Heart Shaped Ruby weighing ~1 ct, there are 12 Natural Round Brilliant Cut diamonds
Category

2010s Italian Engagement Rings

Materials

White Diamond, Ruby, Diamond, Yellow Gold

GIA Certified F1 4ct Colombian Emerald & 2 Gia Diamond FVVS2 Earrings 18kw Gold
Located in New York, NY
GIA Certified F1 4ct Colombian Emerald and 2 GIA Certificates for each of the Diamond 0.85 ct FVVS2
Category

Early 2000s Clip-on Earrings

Materials

Diamond, Emerald, 18k Gold

GIA Certified Marquise Brilliant Cut Diamond Platinum Engagement Ring
By Antinori Fine Jewels
Located in Rome, IT
Exquisite 2.02 ct Total Weight Marquise Brilliant Cut Diamond Platinum Engagement Ring! Crafted
Category

2010s American Engagement Rings

Materials

Diamond, White Diamond, Platinum

GIA certified Tanzanite, Diamond, Sapphire and Emerald Cocktail Ring
By Rosior
Located in Porto, PT
; - 26 blue sapphires weighing 0,49 ct; - 13 blue diamonds weighing 0,22 ct; - 12 emeralds weighing 0,16
Category

21st Century and Contemporary Portuguese Contemporary Cocktail Rings

Materials

Tanzanite, Purple Sapphire, Diamond, White Diamond, Yellow Diamond, Emer...

GIA Certified 2.40 Carat Diamond Platinum Art Deco Engagement Ring
Located in Beverly Hills, CA
One GIA certified 2.40 ct. diamond platinum Art Deco engagement ring centering one prong set, old
Category

Vintage 1930s Art Deco Engagement Rings

Materials

Diamond, Platinum

GIA Certified 1.21 Carat Faint Pink Diamond Ring & Pendant Convertible
Located in Kowloon, HK
pcs - 0.382 cts ➛ Side Pink diamond - 20 pcs - 0.185 ct ➛ Side marquise diamonds - 12 pcs - 0.715
Category

2010s Asian Wedding Rings

Materials

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

Art Deco GIA Certified 2.16 Carat Diamond Engagement Ring
Located in Narberth, PA
ring are 12 old Mine Cut and Single Cut diamonds in a bead setting, which accent the center stone
Category

Vintage 1920s Art Deco Engagement Rings

Materials

Diamond, Platinum

0.62 Carat Very Light Pink Diamond Ring SI2 Clarity GIA Certified
Located in Kowloon, HK
ct ➛ Side Yellow Diamonds - 04 pcs- 0.061 ct ➛ Side MQ Shape Diamonds - 12 pcs - 0.622 ct ♦ GROSS
Category

2010s Asian Engagement Rings

Materials

Pink Diamond, Yellow Diamond, White Diamond, Diamond, White Gold, 18k Gold

GIA Certified 1.15 Carat Light Pinkish Brown Diamond Ring & Pendant Convertible
Located in Kowloon, HK
certified ♦ SIDE STONE DETAILS ➛ Side white diamonds - 12 pcs - 0.124 ct ➛ Side pink diamonds - 28 pcs
Category

2010s Asian Fashion Rings

Materials

Brown Diamond, Pink Diamond, White Diamond, Diamond, White Gold, 18k Gold

9.34 ct AGL Certified Unheated Burma Ruby Ring in Platinum Diamond Setting
Located in La Jolla, CA
9.34 ct AGL Certified Unheated Burma Ruby Ring in Platinum Diamond Setting Unheated Burma Ruby
Category

2010s American Cocktail Rings

Materials

Diamond, Ruby, Platinum

Emilio Jewelry Gia Certified 3.00Carat Flawless Vivid Oval Yellow Diamond
By Emilio!
Located in New York, NY
Avenue.. Center Stone: 3.00 ct Fancy Vivid Yellow OVAL Internally Flawless! setting: 12 white diamonds
Category

21st Century and Contemporary Three-Stone Rings

Materials

Yellow Diamond

Antique Edwardian Platinum 2.38ct GIA Old European Diamond Engagement Ring
Located in Montclair, NJ
solid platinum during the Edwardian period. It features a GIA certified old European cut diamond neatly
Category

Antique Early 1900s Edwardian Engagement Rings

Materials

Diamond, Platinum

GIA White Diamond Pear Cluster Earrings in 18 K White Gold
Located in Los Angeles, CA
Absolutely stunning cluster diamond earrings featuring 18.12 ct. white diamond pear shapes (total
Category

21st Century and Contemporary Lever-Back Earrings

Materials

White Diamond, White Gold

0.83 Carat Fancy Light Pinkish Brown Diamond Ring VS1 Clarity GIA Certified
Located in Kowloon, HK
certified ♦ SIDE STONE DETAILS ➛ Side marquise diamonds - 12 pcs- 0.491 ct ➛ Side Pink diamonds - 20
Category

2010s Asian Engagement Rings

Materials

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

GIA Certified 3.50 Carat Royal Blue Sapphire Round Cut Diamond Ring
By Antinori Fine Jewels
Located in Rome, IT
. One of the most recognized design, the Round cut Center Sapphire is 3.50 ct. Certified by GIA with
Category

2010s Italian Modern Solitaire Rings

Materials

Diamond, Blue Sapphire

Harakh GIA Certified 32.30 Carat Colorless Diamond Dangling White Gold Earrings
By Harakh
Located in New York, NY
Droplets of individually GIA certified high carat 16 round brilliant cut, 12 emerald cut and 6
Category

2010s Indian Contemporary Dangle Earrings

Materials

Diamond, 18k Gold, White Gold

GIA Certified Vintage 0.83ct. Fancy Deep Yellowish Orange Diamond Ballerina Ring
Located in New York, NY
) tapered baguettes, (12) round brilliant diamonds Accent Stone Weight: 0.60 ct. Accent Color/Clarity: G-H
Category

20th Century Unknown Cluster Rings

Materials

Diamond, Platinum

GIA Natural Corundum Sapphire, Round and Baguette Diamond Yellow Gold Ring
Located in Miami, FL
Round Brilliant Cut Diamonds 20 Baguette Diamonds Diamond Carat Weight: approx. 2 ct Diamond Color: G
Category

Early 2000s Cocktail Rings

Materials

Diamond, Blue Sapphire, 18k Gold, Yellow Gold

GIA Certified Burma No Heat Natural Spinel & Diamond & Pearl Bracelet, 18KWG
Located in New York, NY
Treatment Total weight of Three spinel is approximately 12 carat. Diamond weighs is approximately 4.5 ct
Category

2010s Tennis Bracelets

Materials

Diamond, Pearl, Spinel, 18k Gold

GIA Certified NO HEAT BURMA Pink Sapphire Marquise Round Diamond Cocktail Ring
By Antinori Fine Jewels
Located in Rome, IT
BURMESE PINK SAPPHIRE RING WITH 12 MARQUISE DIAMONDS and 1 carat of round brilliant cut diamonds
Category

2010s Italian Modern Engagement Rings

Materials

Diamond, White Diamond, Sapphire, Pink Sapphire, Platinum

Round Pendant Necklace - 18k White Gold - 247 Pavé Diamonds 14.06 ct GVS - 48mm
By Victor Mayer
Located in Pforzheim, DE
diamonds, spiral pavé seting, total 14.06 ct, G VS, 12 round rose-cut diamonds G VS, total 0.08 ct
Category

21st Century and Contemporary German Contemporary Pendant Necklaces

Materials

Diamond, 18k Gold, White Gold

Ladies Platinum 18K White Gold GIA Sri Lanka Sapphires Diamond Drop Earring
Located in Houston, TX
observations and analytical data. Prong Set in Platinum with: Twelve (12) round brilliant cut natural diamonds
Category

21st Century and Contemporary Unknown Drop Earrings

Materials

Diamond, Sapphire, Platinum

GIA Unheated Natural Ruby 2.68 Carat in Diamond Halo Ring in Platinum
Located in La Jolla, CA
GIA Unheated Natural Ruby 2.68 ct in Diamond Halo Ring in Platinum Ruby and Diamond Ring features
Category

21st Century and Contemporary North American Cocktail Rings

Materials

Diamond, Ruby, Platinum

GIA Certified, 0.39cts Oval Natural Fancy Yellowish Green Diamond Ring in 18KT
Located in Hong Kong, HK
: Carat Weight: 0.004 ct Count: 12 Cut: Pear Round White Diamond: Carat Weight: 0.506 ct Count: 53 Cut
Category

21st Century and Contemporary Hong Kong Contemporary Solitaire Rings

Materials

Diamond, Gold, 18k Gold

GIA 0.70's each Round Brilliant Diamond Eternity Band Ring in 18K White Gold
By Kothari
Located in Los Angeles, CA
Beautiful 8.40 ct. white diamond HIJ VS2-SI2 white diamond rounds Total of 12 stones. Handmade in
Category

21st Century and Contemporary Band Rings

Materials

Diamond, White Gold

GIA Certified, 1.04ct Natural Fancy Pink Cushion shape Diamond Ring in 18KT Gold
Located in Hong Kong, HK
: 6 Cut: Pear Pear White Diamond: Carat Weight: 0.113 ct Count: 12 Cut: Pear Round White Diamond
Category

21st Century and Contemporary Hong Kong Contemporary Solitaire Rings

Materials

Diamond, Gold, 18k Gold

GIA Certified, 0.82ct Natural Light Green Cushion Diamond Ring in 18KT in Gold.
Located in Hong Kong, HK
: Pear Pear White Diamond: Carat Weight: 0.113 ct Count: 12 Cut: Pear Round White Diamond: Carat Weight
Category

21st Century and Contemporary Hong Kong Contemporary Solitaire Rings

Materials

Diamond, Gold, 18k Gold

4.60ct Oval Red Star Ruby, Diamond Ring set in Platinum, GIA Certified Unheated
Located in Toronto, Ontario
: Diamond Number of Stones: 36 Total Diamond Weight: 1.15 ct. Measurements: 1.70 x 1.70mm / 3.50 x 2.50mm
Category

2010s Canadian Contemporary Cocktail Rings

Materials

Star Ruby, Ruby, Diamond, Platinum

NEW GIA 3.67CT Untreated Natural Hot Pink Spinel Diamond Ring 14K Yellow Gold
Located in Warren, NJ
, Burma (Myanmar) in the 90's. 12 diamonds totaling 1.13 CT Natural Diamonds Ideal Cut Hearts and Arrows
Category

Antique Late 18th Century Victorian More Rings

Materials

Spinel, Diamond, 14k Gold, Yellow Gold

Illuminate Round Necklace 1/16 CT TW
Located in Dubai, DU
Gold Diamond Diamond Pieces :12 | Diamond Weight (Average Total Cts.) : 0.06 | Diamond Shapes
Category

2010s Emirian Pendant Necklaces

Materials

Diamond, 18k Gold, White Gold

Illuminate Round Necklace 1/10 CT TW
Located in Dubai, DU
Gold Diamond Diamond Pieces :12 | Diamond Weight (Average Total Cts.) : 0.1 | Diamond Shapes : Round
Category

2010s Emirian Pendant Necklaces

Materials

Diamond, 18k Gold, White Gold

Illuminate Round Ring 1/16 CT TW
Located in Dubai, DU
Gold Diamond Diamond Pieces :12 | Diamond Weight (Average Total Cts.) : 0.06 | Diamond Shapes
Category

2010s Emirian Wedding Rings

Materials

Diamond, 18k Gold, White Gold

Illuminate Round Necklace 1/8 CT TW By Rupali Adani Fine Jewellery
Located in Dubai, DU
Gold Diamond Diamond Pieces :12 | Diamond Weight (Average Total Cts.) : 0.1 | Diamond Shapes : Round
Category

2010s Emirian Pendant Necklaces

Materials

Diamond, 18k Gold

Illuminate Round Necklace 1/5 CT TW By Rupali Adani Fine Jewellery
Located in Dubai, DU
Gold Diamond Diamond Pieces :12 | Diamond Weight (Average Total Cts.) : 0.2 | Diamond Shapes : Round
Category

2010s Emirian Pendant Necklaces

Materials

Diamond, 18k Gold

Illuminate Round Necklace 1/20 CT TW By Rupali Adani Fine Jewellery
Located in Dubai, DU
Gold Diamond Diamond Pieces :12 | Diamond Weight (Average Total Cts.) : 0.06 | Diamond Shapes
Category

2010s Emirian Pendant Necklaces

Materials

Diamond, 18k Gold

Illuminate Round Ring 1/20 CT TW By Rupali Adani Fine Jewellery
Located in Dubai, DU
Gold Diamond Diamond Pieces :12 | Diamond Weight (Average Total Cts.) : 0.06 | Diamond Shapes
Category

2010s Emirian Engagement Rings

Materials

Diamond, 18k Gold

Platinum Sapphire Ring, 3.53 Carat Untreated Ceylon Sapphire GIA Certified
Located in Tampa, FL
weight of 3.53 ct. Type II, medium, moderately strong, blue color GIA B 5/4.Set with 12 round brilliant
Category

2010s Sri Lankan Engagement Rings

Materials

Diamond, Sapphire, Blue Sapphire, Platinum

Platinum Ceylon Sapphire Ring, 5.13 Carat Natural Sapphire Gia Origin Certified
Located in Tampa, FL
12 pear cut diamonds @ 1.50 cts, 4 marquise diamonds @ 0.48 cts & 71 round brilliant cut diamonds
Category

2010s Sri Lankan Engagement Rings

Materials

Diamond, Sapphire, Blue Sapphire, Platinum

1943 Ring 5.5 ct natural Cornflow Blue Sapphire solid 18K Gold Ø US4.75/ 4gr
Located in SE
of oval cut 12 mm x 10 mm x 5.12 mm / ca. 5.5 ct that demonstrates peculiar internal inclusions and
Category

Vintage 1940s Swedish Retro Solitaire Rings

Materials

Diamond, Blue Sapphire, 18k Gold

Certified Natural Jade & Diamond Cocktail Ring
Located in New York, NY
Certified Natural Jadeite Jade & Diamond Cocktail Ring 1 cabochon center jade surrounded by 12
Category

Vintage 1980s Cocktail Rings

Materials

Diamond, Jade, Platinum

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

Ladies Platinum Double Halo Diamond Engagement Ring
Located in Houston, TX
, 2018 Pavé set in 950 Platinum with: Twelve (12) round brilliant cut natural diamonds
Category

21st Century and Contemporary Unknown Engagement Rings

Materials

Diamond, Platinum

Cabochon Ruby and Diamond 18K Yellow Gold Ring
Located in Beverly Hills, CA
One ruby and diamond 18K yellow gold centering one bezel set, oval cabochon ruby weighing 10 ct
Category

Vintage 1970s Dome Rings

Materials

Diamond, Ruby, 18k Gold, Yellow Gold

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12 Ct Diamond Gia For Sale on 1stDibs

Surely you’ll find the exact 12 ct diamond gia you’re seeking on 1stDibs — we’ve got a vast assortment for sale. Frequently made of gold, 18k gold and platinum, this item was constructed with great care. In our selection of items, you can find a vintage example as well as a contemporary version. If you’re looking for a 12 ct diamond gia from a specific time period, our collection is diverse and broad-ranging, and you’ll find at least one that dates back to the 18th Century while another version may have been produced as recently as the 21st Century. A 12 ct diamond gia from Antinori Fine Jewels, Harakh and Emilio! — each of whom created a beautiful version of this treasured accessory — is worth considering. A round cut version of this piece has appeal, but there are also cushion cut and emerald cut versions for sale. If you’re browsing our inventory for a 12 ct diamond gia, 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 Ct Diamond Gia?

On average, a 12 ct diamond gia at 1stDibs sells for $14,520, while they’re typically $1 on the low end and $1,365,000 for the highest priced versions of this item.