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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: 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: 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: 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: 4331291 pcs
thumb image of 18.5ct Pear Cabochon Lavender Agate (ID: 433129)
18.52 ct Agate
23 x 16.4 mm
$ 14.82
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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: 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: 4485661 pcs
thumb image of 17.7ct Oval Cabochon Violet Charoite (ID: 448566)
17.74 ct Charoite
21.8 x 15.8 mm
$ 26.61
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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: 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: 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: 3974691 pcs
thumb image of 18ct Asscher Cut Pink Rose Quartz (ID: 397469)
18.01 ct Rose Quartz
15.2 x 15.2 mm
$ 90.05
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ID: 4062941 pcs
thumb image of 18.1ct Round Cabochon Golden Green Cat's Eye Apatite (ID: 406294)
18.11 ct Cat's Eye Apatite
15.3 mm
$ 271.65
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ID: 3483541 pcs
thumb image of 18.9ct Oval Cabochon Grayish Blue Pietersite (ID: 348354)
18.91 ct Pietersite
29.5 x 22.1 mm
$ 75.64
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ID: 3449221 pcs
thumb image of 17.7ct Oval Cabochon Pink Rose Quartz (ID: 344922)
17.74 ct Rose Quartz
17.2 x 14.9 mm
$ 23.95
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ID: 4526841 pcs
thumb image of 19ct Fancy Cabochon Multicolor Ammolite (ID: 452684)
18.98 ct Ammolite
26.1 x 17.4 mm
$ 461.78
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ID: 4485521 pcs
thumb image of 18.4ct Oval Cabochon Violet Charoite (ID: 448552)
18.41 ct Charoite
25.3 x 18.2 mm
$ 27.62
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ID: 3774591 pcs
thumb image of 18.6ct Fancy Cabochon Multicolor Ammolite (ID: 377459)
18.60 ct Ammolite
34.4 x 12.7 mm
$ 701.96
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ID: 4535611 pcs
thumb image of 19ct Fancy Cabochon Multicolor Ammolite (ID: 453561)
18.96 ct Ammolite
27.9 x 14.7 mm
$ 701.52
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ID: 3632111 pcs
thumb image of 18.9ct Round Cabochon Purple Amethyst (ID: 363211)
18.85 ct Amethyst
17.1 mm
$ 94.25
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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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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