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You Selected (332): 18 Carat Gems Clear All
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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: 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: 4620921 pcs
thumb image of 18.3ct Oval Cabochon Multicolor Opal (ID: 462092)
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: 3071711 pcs
thumb image of 17.6ct Oval Cabochon Cream Star Moonstone (ID: 307171)
17.55 ct Star Moonstone
16.4 x 12.7 mm
$ 70.20
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ID: 3914091 pcs
thumb image of 18.8ct Oval Crystal Cluster Multicolor Rainbow Pyrite (ID: 391409)
18.80 ct Rainbow Pyrite
21.4 x 14.7 mm
$ 56.40
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ID: 3842151 pcs
thumb image of 17.7ct Cushion-Cut Greenish Brown Enstatite (ID: 384215)
17.74 ct Enstatite
18.8 x 11.5 mm
$ 1901.91
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ID: 4065071 pcs
thumb image of 18.4ct Pear Facet Pink Kunzite (ID: 406507)
18.38 ct Kunzite
20.4 x 11.7 mm
$ 778.21
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ID: 4074841 pcs
thumb image of 17.5ct Round Carved Cameo White Mother of Pearl (ID: 407484)
17.53 ct Mother of Pearl
25 mm
$ 19.28
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ID: 2551961 pcs
thumb image of 18.5ct Oval Cabochon Green Variscite (ID: 255196)
18.47 ct Variscite
24.8 x 17.9 mm
$ 154.83
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ID: 4515361 pcs
thumb image of 18.1ct Fancy Cabochon Multicolor Ammolite (ID: 451536)
18.07 ct Ammolite
24.8 x 18.4 mm
$ 503.61
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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: 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: 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: 4065081 pcs
thumb image of 18.6ct Pear Facet Pink Kunzite (ID: 406508)
18.57 ct Kunzite
20.5 x 12 mm
$ 786.25
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ID: 3641071 pcs
thumb image of 17.5ct Oval Cabochon Multicolor Jasper (ID: 364107)
17.52 ct Jasper
25.2 x 17.7 mm
$ 35.04
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ID: 3804071 pcs
thumb image of 18.4ct Pear Cabochon Yellow Fire Opal (ID: 380407)
18.36 ct Fire Opal
31.3 x 15.4 mm
$ 396.76
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ID: 4339271 pcs
thumb image of 17.8ct Pear Cabochon Gold Sheen Obsidian (ID: 433927)
17.78 ct Obsidian
21.5 x 18.6 mm
$ 17.78
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ID: 4622401 pcs
thumb image of 17.7ct Oval Facet Blue Kyanite (ID: 462240)
17.71 ct Kyanite
17.5 x 13.5 mm
$ 708.40
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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: 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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18 Carat Gems
Buy gems by price. 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