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12 Carat Amethyst

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12 Carats Amethyst 18 Carats Yellow Gold Marquise Ring
Located in Paris, FR
weight of the gem : 12 carats Dimensions: 24.40 x 15.35 x 9.91 mm (0.960 x 0.605 x 0.390 inch) Finger
Category

Vintage 1970s French Retro Cocktail Rings

Materials

Amethyst, 18k Gold, Yellow Gold

Ico & the Bird Fine Jewelry 11 carat Amethyst Diamond Gold Ring
By Ico & the Bird Fine Jewelry
Located in Los Angeles, CA
center 12 carat Amethyst gem. The concept for this piece came from a cage collection and represents an
Category

2010s Artisan Cocktail Rings

Materials

Amethyst, Diamond, 18k Gold

Green Amethyst Cocktail Ring With Peridots 12 Carats
Located in Laguna Niguel, CA
It comes with the Gemological Appraisal by GIA GG/AJP All Gemstones are Natural Green Amethyst
Category

21st Century and Contemporary Contemporary Cocktail Rings

Materials

Amethyst, Peridot, Silver, Sterling Silver

12 Carat Genuine Natural Amethyst Tennis Bracelet 14 Karat Yellow Gold
Located in New York, NY
This exceptionally affordable Tennis bracelet has 19 stones of oval shape Amethyst Beautiful
Category

2010s Tennis Bracelets

Materials

Amethyst, 14k Gold, Yellow Gold

GIA Certified .12 Carat Diamond Amethyst Pearl Art Nouveau Butterfly Brooch
Located in Stamford, CT
1910 Art Nouveau butterfly brooch. 18k yellow gold with silver tops set with 12 rose cut diamonds
Category

Early 20th Century Brooches

Materials

Amethyst, Diamond, Pearl, Gold, 18k Gold, Yellow Gold, Silver

Vintage Natural Oval Amethyst & Old Euro Diamond Halo Ring Platinum 12 Carat
Located in Carmel-by-the-Sea, CA
: Natural Amethyst Shape: Oval Brilliant Weight: 12 Carats Color: Medium purple violet Clarity: Eye Clean
Category

Vintage 1950s More Rings

Materials

Amethyst, Diamond, Yellow Gold, Platinum

10.00 Carat Amethyst Platinum Ring
Located in Atlanta, GA
Details: Type: Amethyst, Natural GIA REPORT # 2205851670 Weight: Approximate 10 carat Cut: Sugarloaf
Category

Vintage 1920s Unknown Art Deco Engagement Rings

Materials

Amethyst, White Diamond, Platinum

1.97 Carat Amethyst & Diamond Rose Gold Ring
Located in Great Neck, NY
and sophistication to any outfit. This ring features a 1.97 Carat Mixed Cut Pink Amethyst (12 x 9 MM
Category

21st Century and Contemporary Fashion Rings

Materials

Amethyst, Diamond, 14k Gold, Rose Gold

1.97 Carat Amethyst & Diamond Yellow Gold Ring
Located in Great Neck, NY
and sophistication to any outfit. This ring features a 1.97 Carat Mixed Cut Purple Amethyst (12 x 9
Category

21st Century and Contemporary Fashion Rings

Materials

Amethyst, Diamond, Yellow Gold, 14k Gold

48.15 Carat Amethyst Diamond Drop Earrings
By H & H Jewels
Located in Miami, FL
total weight amethyst -12 pieces 0.20 carat F/G VS2 diamond pave -Amethyst earrings -18 karat rose gold
Category

2010s North American Drop Earrings

Materials

Amethyst, Diamond, Rose Gold, Gold, 18k Gold

48.15 Carat Amethyst Diamond Drop Earrings
48.15 Carat Amethyst Diamond Drop Earrings
Free Shipping
W 0.67 in L 1.38 in
Vintage 14k Gold Amethyst Floral Flower Cluster Earrings 12 Carats 11.3 Grams
Located in Lauderdale by the Sea, FL
- approx 12 carats of Amethyst in both earrings combined! They measure approx 0.92 in diameter and weigh
Category

Late 20th Century American Modern More Earrings

Materials

14k Gold

9.00 Carat Amethyst Pearl Yellow Gold Dangle Earrings
Located in Stamford, CT
frame with a pearl above the frame.      12 genuine Amethyst, approx. total weight 9.00ct, 12 x 10mm
Category

Early 20th Century Dangle Earrings

Materials

Amethyst, Pearl, Gold, 14k Gold, Yellow Gold

6.50 Carat Emerald Cut Amethyst Rose Gold Ring
Located in Stamford, CT
. 1 12 x 10mm bright gem natural purple Amethyst, approx. total weight 6.50cts Size 8.5 and sizable
Category

Early 20th Century Fashion Rings

Materials

Amethyst, Emerald, Rose Gold, Gold, 18k Gold

3.50 Carat Octagonal Amethyst Halo Diamond Gold Ring
Located in Stamford, CT
faceted step cut amethyst halo set in an 18k yellow gold setting with 74 full cut round diamonds. 12 x
Category

Mid-20th Century Cocktail Rings

Materials

Amethyst, Diamond, 18k Gold, Yellow Gold, Gold

9.92 Carat Beryl Heliodor Amethyst Yellow Gold Pendant Necklace
Located in Stamford, CT
Beryl Heliodor and amethyst Art Deco style pendant necklace. Made from two bright yellow genuine
Category

21st Century and Contemporary Pendant Necklaces

Materials

Beryl, Amethyst, Gold, 14k Gold, Yellow Gold

12 Ct Emerald Cut Amethyst Pendant /Necklace + 14 Kt Yellow Gold Chain Vintage
Located in New York, NY
Amethyst , approximately 12 Carat. 14 Karat gold 6.33 Grams with stone and chain The pendant comes
Category

Early 2000s Pendant Necklaces

Materials

Amethyst, 14k Gold, Yellow Gold

5.00 Carat Oval Bright Purple Amethyst Filigree Gold Ring
Located in Stamford, CT
Oval purple Amethyst set in a Filigree pierced 14k white gold 12 prong setting. circa 1930's 1
Category

Early 20th Century Fashion Rings

Materials

Amethyst, 14k Gold, White Gold, Gold

54 Carat Bezel Set Amethyst Gold Swirl Link Chain Necklace
Located in Stamford, CT
Early 1900's handmade 14k yellow amethyst necklace. 12 natural oval bezel set amethysts. 14k yellow
Category

Early 20th Century Link Necklaces

Materials

Amethyst, 14k Gold, Yellow Gold, Gold

27.00 Carats Oval Amethyst Yellow Gold Filigree Filigree Link Bracelet
Located in Stamford, CT
1970's Amethyst Filigree bracelet. 6 large warm oval amethyst bezel set amethysts totaling 27.00cts
Category

Late 20th Century Link Bracelets

Materials

Amethyst, Gold, 14k Gold, Yellow Gold

Peter Suchy 36.16 Carat Amethyst Diamond White Gold Pendant Necklace
By Peter Suchy
Located in Stamford, CT
Pear shape 36.16 carat amethyst and diamond pendant necklace. Pear shaped center amethyst with a
Category

21st Century and Contemporary Pendant Necklaces

Materials

Amethyst, Diamond, Gold, 14k Gold, White Gold

1.86 Carat Cushion Cut Amethyst Diamond Sapphire Rose Gold Ring
By Roshe Jewels
Located in Los Angeles, CA
1.86 Carat Cushion Cut Amethyst Diamond Sapphire Rose Gold Ring This cute and dainty ring is great
Category

21st Century and Contemporary American Contemporary Cocktail Rings

Materials

Sapphire, Diamond, Amethyst, Rose Gold, 14k Gold

4.09 Carat Amethyst Pink Sapphire Diamond Rose Gold Cocktail Ring
By Roshe Jewels
Located in Los Angeles, CA
of glittery candy on your finger! This ring has an Oval Cut Amethyst that weighs 2.85 Carats and is
Category

21st Century and Contemporary American Contemporary Cocktail Rings

Materials

Pink Sapphire, Diamond, Amethyst, Rose Gold, 14k Gold

2.65 Carat Pear Shaped Natural Amethyst Diamond Halo Gold Ring
Located in Stamford, CT
14k yellow gold setting. 1 Pear shaped natural gem purple Amethyst, approx. total weight 2.65cts, 12
Category

Late 20th Century Fashion Rings

Materials

Amethyst, Diamond, Gold, 14k Gold, Yellow Gold

87.12 Carat Amethyst Necklace in 18 Karat Rose Gold with Diamonds
By Sunita Nahata
Located in Hong Kong, HK
size - 12 pieces. Amethyst: 26.080 carat octagon briollete shape 8x6 size - 17 pieces. Diamonds: 2.992
Category

21st Century and Contemporary Hong Kong Contemporary Necklace Enhancers

Materials

Amethyst, Diamond, 18k Gold, Rose Gold

4.38 Carats AAA Amethyst Diamonds set in 14K Rose Gold Pendant
Located in Los Angeles, CA
Set with a magnificent Amethyst, here is a lovely 4.38 carats gem that will proclaim your love loud
Category

21st Century and Contemporary Unknown Pendant Necklaces

Materials

Amethyst, Diamond, 14k Gold, Rose Gold

5.87 Carat Amethyst Sapphire and Topaz White Gold Cocktail Ring
By Roshe Jewels
Located in Los Angeles, CA
3.79 carat Amethyst that measures at approximately 10 mm x 12 mm. There are Blue Topaz, Garnet
Category

21st Century and Contemporary American Contemporary Cocktail Rings

Materials

Amethyst, Garnet, Sapphire, Topaz, Blue Topaz, 14k Gold, White Gold

1.99 Carat Cushion Cut Amethyst Diamond Sapphire Yellow Gold Ring
By Roshe Jewels
Located in Los Angeles, CA
1.99 Carat Cushion Cut Amethyst Diamond Sapphire 14K Yellow Gold Ring This cute and dainty ring is
Category

21st Century and Contemporary American Contemporary Cocktail Rings

Materials

Yellow Sapphire, Amethyst, Diamond, Sapphire, 14k Gold, Yellow Gold

Amethyst Diamond Rhodonite Pearl Earrings 3.10 Carat 18 Karat
By Harbor Diamonds
Located in New York, NY
18K White Gold drop earrings featuring two pearls measuring 12-13 mm with diamonds, 0.50 carats
Category

2010s American Contemporary Drop Earrings

Materials

Amethyst, Diamond, Pearl, White Gold

33.00 Carat Garnet Citrine Amethyst Peridot Topaz Three Row Bracelet
Located in Stamford, CT
Indulge in the stunning elegance of our 33.00 Carat Garnet Citrine Amethyst Peridot Topaz Three Row
Category

21st Century and Contemporary Link Bracelets

Materials

Amethyst, Citrine, Garnet, Peridot, Blue Topaz, Topaz, Gold, 14k Gold, Y...

5.39 carats Amethyst Tsavorite Diamond 14K Gold Pendant Necklace
By Meghna Jewels
Located in Hoffman Estate, IL
This pendant necklace is hand set in 14K gold, 5.39 carats amethyst, .43 carats tsavorite and .12
Category

21st Century and Contemporary Unknown Artisan Pendant Necklaces

Materials

Amethyst, Diamond, Tsavorite, 14k Gold

10K Yellow Gold Plated Sterling Silver 12 2/5 Ct Purple Amethyst Dangle Earring
Located in New York, NY
stunning pair of 4 pear-shaped Purple Brazilian Amethyst gemstones, totaling an impressive 12 2/5 carats
Category

21st Century and Contemporary American Contemporary Dangle Earrings

Materials

Amethyst, 10k Gold, Gold Plate, Yellow Gold, Sterling Silver

51.03 Carat AMETHYST Briolette Drops Rose Gold Necklace
Located in Miami, FL
51.03 Carat Briolette Drops Amethyst with Diamonds set on "Forçat Diamond Chain" in 18 Carat Rose
Category

21st Century and Contemporary French Art Deco Rope Necklaces

Materials

Amethyst, Diamond, Gold, 18k Gold, Rose Gold

3.79 Carat Natural Amethyst Pink Sapphire Diamond Rose Gold Engagement Ring
By Roshe Jewels
Located in Los Angeles, CA
3.79 Carat Natural Amethyst Pink Sapphire Diamond Rose Gold Engagement Ring Playful yet Powerful
Category

21st Century and Contemporary American Contemporary Cocktail Rings

Materials

Pink Sapphire, Diamond, Amethyst, Rose Gold, 14k Gold

Natural Amethyst and Blue Topaz Chandelier Earrings 5 Carats
Located in Laguna Niguel, CA
: Amethysts, Blue Topazes Total Carat Weight: 5.00 Carats Cut = Mixed Cut Total Quantity Of Stones: 20 Metal
Category

21st Century and Contemporary Contemporary Dangle Earrings

Materials

Amethyst, Topaz, Blue Topaz, Rhodium, Silver, Sterling Silver

Berca 0.24Kt Champagne Diamond 12 Kt Natural Hand Inlaid Amethyst Heart Pendant
By Berca Atelier
Located in Valenza, IT
Amethyst Heart in a 0.24 Carat Champagne Diamond 18K Handcrafted Yellow Gold Setting. The 29.92 inches
Category

21st Century and Contemporary Italian Modern Pendant Necklaces

Materials

Amethyst, Brown Diamond, Diamond, 18k Gold

4.68 Carat Cushion Cut Amethyst Sapphire Diamond Rose Gold Cocktail Ring
By Roshe Jewels
Located in Los Angeles, CA
designer! This ring has a vibrant Cushion Cut Lavendar colored Amethyst that weighs 3.82 Carats and is
Category

21st Century and Contemporary American Contemporary Cocktail Rings

Materials

Blue Sapphire, Pink Sapphire, Sapphire, Diamond, Amethyst, Rose Gold, 14...

40.00 Carat Quartz Amethyst Ruby Diamond Gold Art Deco Pendant Necklace
Located in Stamford, CT
untreated with Amethyst shaded top and natural mineral inclusions including a liquid filled crystal
Category

Early 20th Century Pendant Necklaces

Materials

Quartz, Amethyst, Diamond, Ruby, Gold, 14k Gold, Rose Gold

1920s 14K White Gold Filigree 3 Carat Amethyst Ring
Located in Lexington, KY
This charming 1920s filigree ring is set in 14K white gold with two beautiful rich purple amethyst
Category

Vintage 1920s Art Deco Fashion Rings

Materials

Amethyst, 14k Gold, White Gold

8 Carat Intense Amethyst 1.15 Carat Diamond Drop Earrings 18 Karat Yellow Gold
By Tom Castor
Located in Lambertville , NJ
measure 12 x 14mm. The four Amethyst combine for a total weight of 8 Carats. The pair of earrings is set
Category

2010s American Contemporary Drop Earrings

Materials

White Diamond, Diamond, Amethyst, 18k Gold, Yellow Gold

Amethyst Cocktail Ring Rhodolite Garnets and White Topazes 7.60 Carats
Located in Laguna Niguel, CA
Carat Stone Size: 12 x 8 mm Cut: Emerald Rhodolite Garnets = 3.85 Carats White Topazes = 0.15 Carts
Category

21st Century and Contemporary Contemporary Cocktail Rings

Materials

Amethyst, Garnet, Topaz, Rhodolite, Rhodium, Silver, Sterling Silver

Natural Opal Amethyst and Diamond Statement Earrings 25.5 Carats Total
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP All Gemstones are Natural 2 Amethysts = 12 Carats 18
Category

21st Century and Contemporary Contemporary Dangle Earrings

Materials

Amethyst, Diamond, White Diamond, Opal, Silver, Sterling Silver

Natural Opal Amethyst and Diamond Statement Earrings 25.5 Carats Total
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP All Gemstones are Natural 2 Amethysts = 12 Carats 18
Category

21st Century and Contemporary Contemporary Dangle Earrings

Materials

Amethyst, Diamond, White Diamond, Opal, Silver, Sterling Silver

Siberian Amethyst Ring With Diamonds 12.20 Carats 14K White Gold
Located in Carlsbad, CA
Siberian Amethyst = 12 Carat (Cut: Mixed, Color: Purple, Origin: Natural) Diamond = 0.20 Carats
Category

21st Century and Contemporary Contemporary Cocktail Rings

Materials

Amethyst, Diamond, White Diamond, Gold, 14k Gold, White Gold

Amethyst Cocktail Ring Rhodolite Garnets and White Topazes 7.60 Carats
Located in Laguna Niguel, CA
Carat Stone Size: 12 x 8 mm Cut: Emerald Rhodolite Garnets = 3.85 Carats White Topazes = 0.15 Carts
Category

21st Century and Contemporary Contemporary Cocktail Rings

Materials

Rhodolite, Topaz, Garnet, Amethyst, Sterling Silver, Silver, Rhodium

Amethyst Cocktail Ring Rhodolite Garnets and White Topazes 7.60 Carats
Located in Laguna Niguel, CA
Carat Stone Size: 12 x 8 mm Cut: Emerald Rhodolite Garnets = 3.85 Carats White Topazes = 0.15 Carts
Category

21st Century and Contemporary Contemporary Cocktail Rings

Materials

Rhodolite, Topaz, Garnet, Amethyst, Sterling Silver, Silver, Rhodium

Amethyst Cocktail Ring Rhodolite Garnets and White Topazes 7.60 Carats
Located in Laguna Niguel, CA
Carat Stone Size: 12 x 8 mm Cut: Emerald Rhodolite Garnets = 3.85 Carats White Topazes = 0.15 Carts
Category

21st Century and Contemporary Contemporary Cocktail Rings

Materials

Rhodolite, Garnet, Amethyst, Topaz, Sterling Silver, Silver, Rhodium

Unique Designer Amethyst & Diamond Ring, 5.00 Carat, 18K Yellow Gold
Located in Honolulu, HI
14 mm x 9.00 mm with an estimated weight of 5.00 carats. The vibrant deep purple Amethyst is prong
Category

21st Century and Contemporary Unknown Modern Cocktail Rings

Materials

Amethyst, Diamond, 18k Gold, Yellow Gold

Amethyst Earrings With White Topazes 7.16 Carats Rhodium Plated Sterling Silver
Located in Laguna Niguel, CA
It comes with the Gemological Appraisal by GIA GG/AJP All Gemstones are Natural 6 Pink Amethysts
Category

21st Century and Contemporary Contemporary Dangle Earrings

Materials

Amethyst, Topaz, Rhodium, Silver, Sterling Silver

36 Carat Amethyst & Diamond Ring 18 Karat Gold Fleur De Lis Royal Purple
By Five Star Jewelry
Located in Austin, TX
This stunningly beautiful 36 carat oval amethyst accented with gorgeous diamonds and fleur de lis
Category

2010s American Modern Cocktail Rings

Materials

Amethyst, Diamond, Gold, 18k Gold, Yellow Gold

Natural Multi Stone 12 Carat Rainbow Tennis Bracelet Set In Silver
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP Natural Stones: Amethyst, Peridot, Citrine, Tanzanite
Category

21st Century and Contemporary Contemporary Tennis Bracelets

Materials

Amethyst, Citrine, Garnet, Opal, Peridot, Tanzanite, Rhodolite, Apatite,...

Natural Multi Stone 12 Carat Rainbow Tennis Bracelet Set In Silver
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP Natural Stones: Amethyst, Peridot, Citrine, Tanzanite
Category

21st Century and Contemporary Contemporary Tennis Bracelets

Materials

Tanzanite, Apatite, Rhodolite, Peridot, Opal, Garnet, Citrine, Amethyst,...

Pampilles Bracelet Yellow Gold 18 Carat Citrines Peridot Amethyst and Diamonds
Located in Paris, FR
Pampilles Bracelet in yellow Gold 18 carats Citrines Peridot Amethyst and Diamonds The bracelet is
Category

1990s Unknown Charm Bracelets

Materials

Amethyst, Citrine, Diamond, Peridot, 18k Gold

Amethyst Earrings With White Topazes 7.16 Carats Rhodium Plated Sterling Silver
Located in Laguna Niguel, CA
It comes with the Gemological Appraisal by GIA GG/AJP All Gemstones are Natural 6 Pink Amethysts
Category

21st Century and Contemporary Contemporary Dangle Earrings

Materials

Amethyst, Topaz, Rhodium, Silver, Sterling Silver

Natural Multi Stone 12 Carat Rainbow Tennis Bracelet Set In Silver
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP Natural Stones: Amethyst, Peridot, Citrine, Tanzanite
Category

21st Century and Contemporary Contemporary Tennis Bracelets

Materials

Amethyst, Citrine, Garnet, Opal, Peridot, Tanzanite, Rhodolite, Apatite,...

Natural Multi Stone 12 Carat Rainbow Tennis Bracelet Set In Silver
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP Natural Stones: Amethyst, Peridot, Citrine, Tanzanite
Category

21st Century and Contemporary Contemporary Tennis Bracelets

Materials

Amethyst, Citrine, Garnet, Opal, Peridot, Tanzanite, Rhodolite, Apatite,...

Natural Multi Stone 12 Carat Rainbow Tennis Bracelet Set In Silver
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP Natural Stones: Amethyst, Peridot, Citrine, Tanzanite
Category

21st Century and Contemporary Contemporary Tennis Bracelets

Materials

Amethyst, Citrine, Garnet, Opal, Peridot, Tanzanite, Rhodolite, Apatite,...

Deep Purple Amethyst 10 Carat Diamond Earrings 18 Karat White Gold
Located in North Hollywood, CA
These earrings are made from 2 emerald cut Amethyst Stones approximately 4 carats each to total 8
Category

2010s American Modern Clip-on Earrings

Materials

Amethyst, White Diamond, 18k Gold

Natural Multi Stone 12 Carat Rainbow Tennis Bracelet Set In Silver
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP Natural Stones: Amethyst, Peridot, Citrine, Tanzanite
Category

21st Century and Contemporary Contemporary Tennis Bracelets

Materials

Amethyst, Citrine, Garnet, Opal, Peridot, Tanzanite, Rhodolite, Apatite,...

Natural Multi Stone 12 Carat Rainbow Tennis Bracelet Set In Silver
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP Natural Stones: Amethyst, Peridot, Citrine, Tanzanite
Category

21st Century and Contemporary Contemporary Tennis Bracelets

Materials

Amethyst, Citrine, Garnet, Opal, Peridot, Tanzanite, Rhodolite, Apatite,...

Natural Multi Stone 12 Carat Rainbow Tennis Bracelet Set In Silver
Located in Laguna Niguel, CA
It comes with the appraisal by GIA GG/AJP Natural Stones: Amethyst, Peridot, Citrine, Tanzanite
Category

21st Century and Contemporary Contemporary Tennis Bracelets

Materials

Amethyst, Citrine, Garnet, Opal, Peridot, Tanzanite, Rhodolite, Apatite,...

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12 Carat Amethyst For Sale on 1stDibs

Surely you’ll find the exact 12 carat amethyst you’re seeking on 1stDibs — we’ve got a vast assortment for sale. Every item for sale was constructed with extraordinary care, often using Gold, Yellow Gold and 14k Gold. Find an antique version now, or shop for 28 vintage or 34 modern creation for a more contemporary example of these cherished accessories. Finding the perfect 12 carat amethyst may mean sifting through those created during different time periods — you can find an early version that dates to the 19th Century and a newer variation that were made as recently as the 21st Century. For this particular piece, .5 Carat and 1 Carat are consistently popular carat weights. Finding an appealing 12 carat amethyst — no matter the origin — is easy, but Luigi Ferrara, Roxa and D and A Style each produced a popular version that is worth a look. A 12 carat amethyst of any era or style can lend versatility to your look, but a version featuring Amethyst, from our inventory of 49, is particularly popular. Today, if you’re looking for an oval cut version of this piece and are unable to find the perfect match, our selection also includes round cut and cushion cut alternatives. Finding a 12 carat amethyst for sale for women should be easy, but there are 14 pieces available to browse for unisex as well as men, too.

How Much is a 12 Carat Amethyst?

On average, a 12 carat amethyst at 1stDibs sells for $2,225, while they’re typically $308 on the low end and $98,500 for the highest priced versions of this item.
Questions About 12 Carat Amethyst
  • 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.