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ID: 3781971 pcs
thumb image of 12ct Cushion-Cut Violet Blue Tanzanite (ID: 378197)
12.03 ct Tanzanite
13.1 x 12.8 mm
$ 6123.75
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ID: 4164631 pcs
thumb image of 12.3ct Oval Facet Golden Green Tourmaline (ID: 416463)
12.25 ct Tourmaline
15.7 x 12.8 mm
$ 2450.00
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ID: 3946421 pcs
thumb image of 12.7ct Asscher Cut Lemon Quartz (ID: 394642)
12.65 ct Quartz
14.2 x 14.2 mm
$ 63.25
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ID: 3286021 pcs
thumb image of 12.2ct Carved Rose with Half Drilled Hole Gold Brown Tiger's Eye (ID: 328602)
12.17 ct Tiger's Eye
15.6 x 13.7 mm
$ 14.60
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ID: 2715391 pcs
thumb image of 12.5ct Pear Cabochon Green Chrysoprase (ID: 271539)
12.50 ct Chrysoprase
16.2 x 13.6 mm
$ 56.25
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ID: 4503721 pcs
thumb image of 11.9ct Baguette / Scissor Cut Light Blue Aquamarine (ID: 450372)
11.89 ct Aquamarine
16.8 x 9.9 mm
$ 2972.50
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ID: 4503711 pcs
thumb image of 11.9ct Octagon / Scissor Cut Light Blue Aquamarine (ID: 450371)
11.87 ct Aquamarine
17.4 x 10 mm
$ 2967.50
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ID: 3493001 pcs
thumb image of 12.5ct Oval Cabochon Pink Rose Quartz (ID: 349300)
12.53 ct Rose Quartz
14.8 x 12.4 mm
$ 16.29
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ID: 4185491 pcs
thumb image of 12.8ct Oval Cabochon Cream Star Moonstone (ID: 418549)
12.80 ct Star Moonstone
16.3 x 13.9 mm
$ 51.20
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ID: 4183651 pcs
thumb image of 12.6ct Oval Cabochon Cream Star Moonstone (ID: 418365)
12.57 ct Star Moonstone
14.7 x 12.1 mm
$ 50.28
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ID: 3825551 pcs
thumb image of 12.6ct Oval Cabochon Pastel Green Jadeite (ID: 382555)
12.59 ct Jadeite
18.4 x 13.7 mm
$ 25.18
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ID: 4843881 pcs
thumb image of 12.5ct Oval Cabochon Cream Star Moonstone (ID: 484388)
12.51 ct Star Moonstone
15.3 x 13.2 mm
$ 50.04
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ID: 4185461 pcs
thumb image of 12.4ct Oval Cabochon Cream Star Moonstone (ID: 418546)
12.43 ct Star Moonstone
18.2 x 12.4 mm
$ 49.72
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ID: 4168631 pcs
thumb image of 12.4ct Oval Cabochon Cream Star Moonstone (ID: 416863)
12.35 ct Star Moonstone
14.6 x 12.3 mm
$ 49.40
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ID: 4851831 pcs
thumb image of 12.4ct Carved Flower Cabochon Light Pink Rose Quartz (ID: 485183)
12.37 ct Rose Quartz
17.8 x 17.6 mm
$ 86.59
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ID: 4708451 pcs
thumb image of 12.1ct Oval Cabochon Grayish Silver Star Sapphire (ID: 470845)
12.12 ct Star Sapphire
12.3 x 11.4 mm
$ 424.20
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ID: 4825041 pcs
thumb image of 12.1ct Cushion Cabochon Multicolor Sugilite (ID: 482504)
12.11 ct Sugilite
18.1 x 12.5 mm
$ 60.55
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ID: 4817641 pcs
thumb image of 12.9ct Round Cabochon Cream Cat's Eye Moonstone (ID: 481764)
12.91 ct Cat's Eye Moonstone
15.2 mm
$ 51.64
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ID: 4242991 pcs
thumb image of 12.8ct Oval Cabochon Red Orange Spessartite Garnet (ID: 424299)
12.76 ct Spessartite Garnet
14.9 x 11.9 mm
$ 280.72
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ID: 4737761 pcs
thumb image of 12.5ct Round Cabochon White Cat's Eye Moonstone (ID: 473776)
12.50 ct Cat's Eye Moonstone
13.8 mm
$ 50.00
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ID: 3847931 pcs
thumb image of 13ct Marquise Slice Bi-Color Ruby in Fuchsite (ID: 384793)
12.97 ct Ruby in Fuchsite
29.8 x 15.2 mm
$ 88.59
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12 Carat Gems
Buy gems by weight. Select the best 12 carat gems from a wide array of colored stones, including rare gem types such as scapolite, black opal and pietersite. Also available are beautiful and popular faceted gems, including tanzanite, zircon and tourmaline. Large 12-carat gems make perfect statement stones, whether they are worn as a necklace pendant, ring or another jewelry design. Browse the largest selection of natural loose colored gemstones available in 12 carats. From here, you can use our filters at the top or on the left-hand side to find gems by gem type, color, shape, cut and so on. For example, select 'jadeite' to see all of our 12-carat jadeite gems. Select 'green' to shop for 12-carat green gems. You can also filter by single, pairs, lots, faceted gems or cabochons by using the check boxes at the top.
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart