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ID: 4519071 pcs
thumb image of 18.9ct Oval Facet Lemon Quartz (ID: 451907)
18.90 ct Quartz
17.4 x 14.4 mm
$ 28.35
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ID: 4139681 pcs
thumb image of 18.8ct Oval Cabochon Cream Star Moonstone (ID: 413968)
18.80 ct Star Moonstone
15.6 x 14 mm
$ 75.20
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ID: 3639141 pcs
thumb image of 18.6ct Pear Cabochon Multicolor Jasper (ID: 363914)
18.58 ct Jasper
31.3 x 14.4 mm
$ 27.87
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ID: 4170221 pcs
thumb image of 17.9ct Oval Cabochon Cream Peach Star Moonstone (ID: 417022)
17.93 ct Star Moonstone
16.6 x 15.3 mm
$ 71.72
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ID: 4672701 pcs
thumb image of 18.3ct Oval Cabochon White Opal (ID: 467270)
18.33 ct Opal
20 x 16.9 mm
$ 737.97
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ID: 4170301 pcs
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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ID: 4454141 pcs
thumb image of 18.8ct Oval Checkerboard Violet-Blue Color-Change Fluorite (ID: 445414)
18.83 ct Color-Change Fluorite
19.8 x 15 mm
$ 472.26
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ID: 3719141 pcs
thumb image of 18.4ct Round Cabochon Mocha Moonstone (ID: 371914)
18.40 ct Moonstone
17.6 mm
$ 82.80
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ID: 4815141 pcs
thumb image of 17.9ct Oval Cabochon Cream Cat's Eye Moonstone (ID: 481514)
17.89 ct Cat's Eye Moonstone
20.1 x 15 mm
$ 87.66
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ID: 3632971 pcs
thumb image of 17.8ct Oval Cabochon Multicolor Jasper (ID: 363297)
17.79 ct Jasper
25.2 x 18.1 mm
$ 35.58
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ID: 3983651 pcs
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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ID: 4209831 pcs
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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ID: 3933201 pcs
thumb image of 18.6ct Asscher Cut Pink Rose Quartz (ID: 393320)
18.64 ct Rose Quartz
16.1 x 16.1 mm
$ 93.20
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ID: 3102691 pcs
thumb image of 18.7ct Oval Facet Yellow Golden Zircon (ID: 310269)
18.67 ct Zircon
15.9 x 12.5 mm
$ 1540.28
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ID: 4722851 pcs
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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ID: 4339361 pcs
thumb image of 17.6ct Fancy Cabochon Gold Sheen Obsidian (ID: 433936)
17.56 ct Obsidian
19.9 x 19.7 mm
$ 17.56
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ID: 4338371 pcs
thumb image of 17.7ct Oval Cabochon Gold Sheen Obsidian (ID: 433837)
17.66 ct Obsidian
21.7 x 15.9 mm
$ 17.66
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ID: 4339341 pcs
thumb image of 18ct Fancy Cabochon Gold Sheen Obsidian (ID: 433934)
18.01 ct Obsidian
23.5 x 17.5 mm
$ 18.01
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ID: 4337231 pcs
thumb image of 18.4ct Pear Cabochon Gold Sheen Obsidian (ID: 433723)
18.42 ct Obsidian
28.4 x 16.3 mm
$ 18.42
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ID: 4800581 pcs
thumb image of 17.5ct Carved Fruit Cabochon Swiss Blue Topaz (ID: 480058)
17.50 ct Topaz
23.2 x 12.9 mm
$ 87.50
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ID: 4477541 pcs
thumb image of 18.6ct Trillion Cabochon Gold Sheen Obsidian (ID: 447754)
18.62 ct Obsidian
23.2 x 23.7 mm
$ 18.62
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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.
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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