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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: 4503771 pcs
thumb image of 12.2ct Octagon / Scissor Cut Light Blue Aquamarine (ID: 450377)
12.17 ct Aquamarine
16 x 11.2 mm
$ 3099.00
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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: 3286051 pcs
thumb image of 12.2ct Carved Rose with Half Drilled Hole Gold Brown Tiger's Eye (ID: 328605)
12.19 ct Tiger's Eye
16.2 x 15.4 mm
$ 14.63
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ID: 3641261 pcs
thumb image of 11.9ct Oval Cabochon Multicolor Jasper (ID: 364126)
11.88 ct Jasper
22.2 x 16.3 mm
$ 23.76
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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: 3847981 pcs
thumb image of 12ct Marquise Slice Bi-Color Ruby in Fuchsite (ID: 384798)
12.02 ct Ruby in Fuchsite
28.6 x 15.5 mm
$ 82.10
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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: 3801071 pcs
thumb image of 12.5ct Cushion Cabochon Yellow Orange Fire Opal (ID: 380107)
12.52 ct Fire Opal
17.3 x 14.2 mm
$ 438.20
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ID: 3285971 pcs
thumb image of 12.4ct Carved Rose with Half Drilled Hole Gold Brown Tiger's Eye (ID: 328597)
12.40 ct Tiger's Eye
15.4 x 14 mm
$ 14.88
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ID: 4693211 pcs
thumb image of 11.5ct Oval Cabochon Violet Blue Sodalite (ID: 469321)
11.53 ct Sodalite
20.2 x 15.1 mm
$ 12.11
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ID: 4355691 pcs
thumb image of 12.1ct Pear Cabochon Colorless Golden Rutile Quartz (ID: 435569)
12.09 ct Rutile Quartz
18.1 x 13.1 mm
$ 29.98
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ID: 4603311 pcs
thumb image of 11.7ct Oval Cabochon Green Chrysoprase (ID: 460331)
11.67 ct Chrysoprase
13.9 x 13.2 mm
$ 46.68
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ID: 4490741 pcs
thumb image of 12.8ct Round Cabochon Golden Red Rutile Quartz (ID: 449074)
12.77 ct Rutile Quartz
15.8 mm
$ 31.92
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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: 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: 4589361 pcs
thumb image of 11.9ct Oval Cabochon Blue Lapis Lazuli (ID: 458936)
11.88 ct Lapis Lazuli
18.3 x 13.4 mm
$ 11.88
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ID: 3335701 pcs
thumb image of 12.4ct Spherical Golden Pearl (ID: 333570)
12.37 ct Pearl
12.1 mm
$ 252.60
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ID: 3775131 pcs
thumb image of 11.6ct Fancy Cabochon Multicolor Ammolite (ID: 377513)
11.61 ct Ammolite
22.4 x 13.9 mm
$ 438.16
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ID: 4168541 pcs
thumb image of 12.8ct Oval Cabochon Smoke Star Moonstone (ID: 416854)
12.76 ct Star Moonstone
15.9 x 9.9 mm
$ 51.04
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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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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