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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: 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: 4919861 pcs
thumb image of 17.7ct Pear Cabochon Bluish White Rainbow Moonstone (ID: 491986)
17.71 ct Rainbow Moonstone
24.9 x 13.4 mm
$ 29.58
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ID: 3936491 pcs
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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ID: 4825031 pcs
thumb image of 18.7ct Pear Cabochon Multicolor Sugilite (ID: 482503)
18.65 ct Sugilite
22.3 x 15.1 mm
$ 93.25
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ID: 4865981 pcs
thumb image of 17.5ct Pencil Gold Brown Tiger's Eye (ID: 486598)
17.50 ct Tiger's Eye
28.9 mm
$ 8.75
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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: 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: 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: 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: 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: 4205001 pcs
thumb image of 17.8ct Oval Cabochon Green Jadeite (ID: 420500)
17.80 ct Jadeite
20.8 x 16.5 mm
$ 26.70
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ID: 4473801 pcs
thumb image of 18.2ct Pear Cabochon Blue Larimar (ID: 447380)
18.24 ct Larimar
29.1 x 17.6 mm
$ 182.40
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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: 4914401 pcs
thumb image of 18.5ct Square Cabochon Bluish White Rainbow Moonstone (ID: 491440)
18.49 ct Rainbow Moonstone
16.3 x 15.9 mm
$ 30.88
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ID: 4851051 pcs
thumb image of 18.4ct Pencil Multicolor Bloodstone (ID: 485105)
18.39 ct Bloodstone
33.5 mm
$ 61.77
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ID: 4855291 pcs
thumb image of 17.6ct Pear Cabochon Snowflake Snowflake Obsidian (ID: 485529)
17.63 ct Snowflake Obsidian
22.9 x 21.6 mm
$ 7.30
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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: 4867621 pcs
thumb image of 18.9ct Pencil Multicolor Jasper (ID: 486762)
18.92 ct Jasper
33.2 mm
$ 5.30
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ID: 2563491 pcs
thumb image of 18.8ct Carved Rose Salmon Coral (ID: 256349)
18.78 ct Coral
18.1 x 16.9 mm
$ 300.48
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ID: 4036661 pcs
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.
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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