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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (861): 12 Carat Gems Clear All
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thumb image of 13ct Fantasy Carved Leaf Lemon Quartz (ID: 474975)
12.97 ct Quartz
15.9 x 15.3 mm
$ 45.40
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thumb image of 12.3ct Octagon / Scissor Cut Bi-Color Ametrine (ID: 394370)
12.30 ct Ametrine
17.1 x 12 mm
$ 65.56
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thumb image of 12ct Cushion-Cut Violet Blue Tanzanite (ID: 378197)
12.03 ct Tanzanite
13.1 x 12.8 mm
$ 6,123.75
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thumb image of 12.3ct Oval Facet Golden Green Tourmaline (ID: 416463)
12.25 ct Tourmaline
15.7 x 12.8 mm
$ 2,450.00
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thumb image of 11.7ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435531)
11.65 ct Rutile Quartz
15.1 mm
$ 28.89
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thumb image of 11.9ct Baguette / Scissor Cut Light Blue Aquamarine (ID: 450372)
11.89 ct Aquamarine
16.8 x 9.9 mm
$ 2,972.50
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thumb image of 12.9ct Fancy Cabochon Multicolor Fire Agate (ID: 486977)
12.90 ct Fire Agate
25.2 x 14.7 mm
$ 99.72
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thumb image of 12.9ct Baguette Rose-Cut Black Spinel (ID: 372535)
12.86 ct (total 25.72ctw) Spinel
17.7 x 8.3 mm
$ 184.67
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thumb image of 11.9ct Oval Cabochon Multicolor Cat's Eye Opal (ID: 484212)
11.91 ct Cat's Eye Opal
15.5 x 13 mm
$ 59.55
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thumb image of 11.9ct Octagon / Scissor Cut Light Blue Aquamarine (ID: 450371)
11.87 ct Aquamarine
17.4 x 10 mm
$ 2,967.50
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thumb image of 12.1ct Fancy Cabochon Multicolor Fire Agate (ID: 487153)
12.12 ct Fire Agate
17.7 x 12.8 mm
$ 93.69
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thumb image of 12.5ct Oval Cabochon Blue Lapis Lazuli (ID: 499169)
12.54 ct (total 25.07ctw) Lapis Lazuli
16.2 x 12.2 mm
$ 39.36
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thumb image of 12.8ct Baguette Rose-Cut Black Spinel (ID: 372537)
12.76 ct (total 25.51ctw) Spinel
17.6 x 8.2 mm
$ 183.16
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Click for Product Video (484309)
thumb image of 12.4ct Oval Cabochon Multicolor Cat's Eye Opal (ID: 484309)
12.43 ct Cat's Eye Opal
16.7 x 13.7 mm
$ 62.15
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thumb image of 12.6ct Drilled Sphere Multicolor Jasper (ID: 361819)
12.61 ct (total 25.21ctw) Jasper
12.3 mm
$ 25.21
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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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thumb image of 11.5ct Carved Rose with Half Drilled Hole Gold Brown Tiger's Eye (ID: 343468)
11.54 ct Tiger's Eye
15.6 x 15.1 mm
$ 13.85
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thumb image of 12.7ct Baguette Rose-Cut Black Spinel (ID: 372542)
12.67 ct (total 25.34ctw) Spinel
17.6 x 8.2 mm
$ 181.94
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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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thumb image of 12.8ct Marquise Cabochon Multicolor Jasper (ID: 391180)
12.78 ct (total 25.56ctw) Jasper
28.6 x 13 mm
$ 38.34
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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
Item in Stock
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.
Certified Customer Reviews
Overall Rating -> 10 star ratings
offer military prices
Posted By Frobb1968 in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Trustworthy company & site, great products.
Posted By KM in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I have been ordering from GemSelect for at least 6 years. Every single order was perfect - every item was as advertized, in perfect condition and arrived well within the specified time frame. I have recommended them to several friends.
Posted By Jim in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Excellent company with excellent website!
Posted By Marcy in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Happy with price and ease of purchase. Will tell others
Posted By JJ Kool Juan in August, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Very pleased with my purchase in all aspects!!!!!
Posted By JJ Kool Juan in August, 2018
Source: Bizrate
English speaking customer support only

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International:
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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