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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (417): 18 Carat Gems Clear All
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17.7ct Pencil Gold Brown Tiger's Eye Gem (ID: 486600)
17.70 ct Tiger's Eye
33.7 x 8.4 mm
$ 8.85
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18.4ct Pencil Multicolor Bloodstone Gem (ID: 485111)
18.39 ct Bloodstone
29.2 x 9.1 mm
$ 80.97
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18.3ct Oval Cabochon Multicolor Opal Gem (ID: 467270)
18.33 ct Opal
20 x 16.9 mm
$ 737.97
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18.1ct Oval Facet Lemon Quartz Gem (ID: 451903)
18.09 ct Quartz
16.9 x 14.9 mm
$ 27.14
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18.8ct Oval Checkerboard Violet to Blue Color-Change Fluorite Gem (ID: 445414)
18.83 ct Color-Change Fluorite
19.8 x 15 mm
$ 472.26
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19ct Pencil Multicolor Jasper Gem (ID: 486760)
18.97 ct Jasper
28.7 x 9 mm
$ 5.31
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17.7ct Oval Cabochon Cream Star Moonstone Gem (ID: 420983)
17.73 ct Star Moonstone
17 x 13.3 mm
$ 53.19
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17.8ct Round Cabochon Gray Blue Sheen Labradorite Gem (ID: 489606)
17.80 ct Labradorite
17.3 mm
$ 17.98
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18.4ct Pencil Multicolor Bloodstone Gem (ID: 485113)
18.43 ct Bloodstone
29.2 x 9.2 mm
$ 80.19
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17.8ct Cushion-Cut Greenish Golden Apatite Gem (ID: 398365)
17.76 ct Apatite
16.1 x 16 mm
$ 845.55
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18.5ct Oval Facet Light Pink Rose Quartz Gem (ID: 499943)
18.51 ct Rose Quartz
19.5 x 16 mm
$ 92.55
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18.1ct Pencil Blue Lapis Lazuli Gem (ID: 488651)
18.06 ct Lapis Lazuli
29.5 x 8.3 mm
$ 5.06
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18.6ct Pencil Blue Lapis Lazuli Gem (ID: 488188)
18.64 ct Lapis Lazuli
32.1 x 7.9 mm
$ 5.22
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18.3ct Cushion Mixed Cut Red Orange Spessartite Garnet Gem (ID: 486943)
18.30 ct Spessartite Garnet
18.7 x 11.8 mm
$ 732.00
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17.5ct Oval Facet Red Strawberry Quartz Gem (ID: 472285)
17.53 ct Strawberry Quartz
19.6 x 14.8 mm
$ 122.71
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18.4ct Oval Cabochon Black Gold Sheen Obsidian Gem (ID: 433734)
18.42 ct Obsidian
25.2 x 16.5 mm
$ 18.42
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18.8ct Fancy Cabochon Multicolor Ammolite Gem (ID: 494372)
18.82 ct Ammolite
33.5 x 14 mm
$ 282.30
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18.6ct Oval Cabochon Bluish White Rainbow Moonstone Gem (ID: 491455)
18.56 ct Rainbow Moonstone
22.1 x 13.5 mm
$ 31.00
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18.6ct Shark Fin Cabochon Multicolor Ammolite Gem (ID: 494354)
18.57 ct Ammolite
24 x 16.6 mm
$ 278.55
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18.4ct Pear Facet Pink Kunzite Gem (ID: 406507)
18.38 ct Kunzite
20.4 x 11.7 mm
$ 367.60
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17.7ct Fancy Cabochon Multicolor Ammolite Gem (ID: 377466)
17.66 ct Ammolite
27.8 x 15.4 mm
$ 176.60
Item in Stock
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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
Loved the wide selection of product
Posted By Miki in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
finally bought the last rock to complete my ring idea; needed another white one after giving the big diamond to my daughter. a diamond that size is out of my retired-school-teacher budget, so i bought a white zircon. went back to the same place that i got my loose sapphire-- great selection, good prices, good delivery!
Posted By Ptcmom in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I'm always real pleased with this website, I don't think there is much you could do to make it any better. I wish the shipping charges were lower, but it is understandable.
Posted By Spinch13 in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
This is a site that sources valuable and genuine stones forms around the world, with and honest and descriptive sections, as well as specs, and the option to have the gemstone collection one might purchased—certified! Price ranges vary, but are always affordable and always worth it, whether it’s a gift, or for a personal business.
Posted By Bradley in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I am bored and shopping , it was fun
Posted By Nanorex in November, 2018
Source: Bizrate
Overall Rating -> 9 star ratings
I recently found a site on-line where you can purchase faceted gems. I made one purchase, and the day the gems arrived, I was so happy with them, that I immediately went back on-line and purchased four more gems! They look better "in person" than they do on the computer screen. I am making purchases for gifts.
Posted By GeneticBlend in October, 2018
Source: Bizrate
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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