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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (427): 18 Carat Gems Clear All
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thumb image of 17.8ct Oval Cabochon Cream Star Moonstone (ID: 417030)
17.80 ct Star Moonstone
17.7 x 14.8 mm
$ 71.20
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thumb image of 18.2ct Oval Cabochon Pink Rose Quartz (ID: 345947)
18.24 ct Rose Quartz
16.9 x 15.7 mm
$ 23.71
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thumb image of 19ct Trillion Cabochon Multicolor Sugilite (ID: 490045)
18.99 ct Sugilite
21.2 x 18.5 mm
$ 10.63
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thumb image of 18.4ct Pencil Multicolor Bloodstone (ID: 485111)
18.39 ct Bloodstone
29.2 mm
$ 80.97
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thumb image of 18.5ct Asscher Cut Pink Rose Quartz (ID: 393649)
18.48 ct Rose Quartz
16.5 x 16.3 mm
$ 92.40
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thumb image of 18.4ct Pencil Multicolor Bloodstone (ID: 485113)
18.43 ct Bloodstone
29.2 mm
$ 80.19
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thumb image of 19ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 450365)
18.95 ct (total 37.89ctw) Agate Geode
23.6 x 16.2 mm
$ 94.35
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thumb image of 18.8ct Oval Checkerboard Violet to Blue Color-Change Fluorite (ID: 445414)
18.83 ct Color-Change Fluorite
19.8 x 15 mm
$ 472.26
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thumb image of 18.1ct Oval Cabochon White Green Jadeite (ID: 481603)
18.09 ct Jadeite
18.4 x 16.4 mm
$ 19.72
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thumb image of 17.7ct Fancy Crystal Cluster Multicolor Agate Geode (ID: 446999)
17.71 ct (total 35.41ctw) Agate Geode
21.5 x 19.1 mm
$ 88.52
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thumb image of 17.7ct Pencil Gold Brown Tiger's Eye (ID: 486600)
17.70 ct Tiger's Eye
33.7 mm
$ 8.85
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thumb image of 18.2ct Oval Cabochon Mocha Moonstone (ID: 401358)
18.19 ct Moonstone
20 x 15.2 mm
$ 27.29
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thumb image of 19ct Pencil Multicolor Jasper (ID: 486760)
18.97 ct Jasper
28.7 mm
$ 5.31
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thumb image of 17.8ct Cushion-Cut Greenish Golden Apatite (ID: 398365)
17.76 ct Apatite
16.1 x 16 mm
$ 845.55
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thumb image of 17.7ct Oval Cabochon Cream Star Moonstone (ID: 420983)
17.73 ct Star Moonstone
17 x 13.3 mm
$ 53.19
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thumb image of 18.7ct Cushion Cabochon Multicolor Ammolite (ID: 494102)
18.74 ct Ammolite
29.3 x 12.8 mm
$ 149.92
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thumb image of 18.4ct Pencil Multicolor Bloodstone (ID: 485105)
18.39 ct Bloodstone
33.5 mm
$ 61.77
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thumb image of 18.6ct Pencil Multicolor Bloodstone (ID: 485112)
18.64 ct Bloodstone
22.6 mm
$ 58.76
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thumb image of 17.5ct Oval Facet Red Strawberry Quartz (ID: 472285)
17.53 ct Strawberry Quartz
19.6 x 14.8 mm
$ 122.71
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thumb image of 18.3ct Round Cabochon Violet Amethyst (ID: 393346)
18.32 ct Amethyst
18.9 mm
$ 91.60
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thumb image of 18.2ct Pear Facet Colorless Golden Rutile Quartz (ID: 403666)
18.19 ct Rutile Quartz
20.3 x 17.1 mm
$ 96.23
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18 Carat Gems
Buy gems by weight. Shop from our extensive range of beautiful, natural 18-carat gems. Browse the largest selection of natural loose colored gemstones available in 18 carats. Our large gemstone selection includes many popular gem types, such as amethyst, citrine, topaz and turquoise, and lesser-known gems, including ammolite, cat's eye aquamarine and maw-sit-sit. Large, natural 18-carat gems are perfect for making statement jewelry, such as oversized pendants and rings. 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 'moonstone' to see all of our 18-carat moonstone gems. Select 'pink' to shop for 18-carat pink 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
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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