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Buy 18 Carat Gems

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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (473): 18 Carat Gems Clear All
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Pink Kunzite Gem - 18.2ct Pear Facet (ID: 441251)

Pear Pink Kunzite

18.2ct
18.6 x 13.2 mm
$ 364.80
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Yellow Golden Citrine Gem - 18.6ct Oval Facet (ID: 446383)

Oval Yellow Citrine

18.6ct
18.4 x 13.7 mm
$ 111.84
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Bi-color Ametrine Gem - 18.3ct Octagon Step Cut (ID: 461677)

Octagon / Emerald Cut Bi-color Ametrine

18.3ct
15.1 x 13.3 mm
$ 128.17
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Red Orange Spessartite Garnet Gem - 18.3ct Cushion Mixed Cut (ID: 486943)

Cushion Orange Spessartite Garnet

18.3ct
18.7 x 11.8 mm
$ 732.00
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Colorless with Brown Rutile Quartz Gem - 18ct Round Cabochon (ID: 395601)

Round Colorless Rutile Quartz

18ct
17.2 mm
$ 57.21
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Greenish Golden Apatite Gem - 17.8ct Cushion-Cut (ID: 398365)

Cushion Yellow Apatite

17.8ct
16.1 x 16 mm
$ 845.55
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Blue-Green Cat's Eye Aquamarine Gem - 18ct Oval Cabochon (ID: 333925)

Oval Green Cat's Eye Aquamarine

18ct
18.8 x 11.6 mm
$ 323.28
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Colorless with Golden Rutile Quartz Gem - 18.5ct Oval Cabochon (ID: 402347)

Oval Colorless Rutile Quartz

18.5ct
21.7 x 14.5 mm
$ 59.29
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Violet to Blue Color-Change Fluorite Gem - 18.8ct Oval Checkerboard (ID: 445414)

Oval Multicolor Color-Change Fluorite

18.8ct
19.8 x 15 mm
$ 472.26
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Multicolor Ammolite Gem - 17.8ct Trillion Cabochon (ID: 375969)

Trillion Multicolor Ammolite

17.8ct
30.1 x 17.7 mm
$ 178.00
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Multicolor Fossil Coral Gem - 18ct Cushion Cabochon (ID: 514174)

Cushion Multicolor Fossil Coral

18.00 ct (total 35.99ctw)
20.4 x 12.7 mm
$ 71.26
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Multicolor Ammolite Gem - 18.3ct Fancy Cabochon (ID: 522528)

Fancy Multicolor Ammolite

18.3ct
28 x 15.9 mm
$ 366.80
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Multicolor Fossil Coral Gem - 17.5ct Cushion Cabochon (ID: 450086)

Cushion Multicolor Fossil Coral

17.53 ct (total 35.05ctw)
18.6 x 14.3 mm
$ 70.10
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Multicolor Ammolite Gem - 18.1ct Fancy Cabochon (ID: 451536)

Fancy Multicolor Ammolite

18.1ct
24.8 x 18.4 mm
$ 180.70
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Red Strawberry Quartz Gem - 17.5ct Oval Facet (ID: 472285)

Oval Red Strawberry Quartz

17.5ct
19.6 x 14.8 mm
$ 122.71
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Green Chrysoprase Gem - 18.9ct Oval Cabochon (ID: 505453)

Oval Green Chrysoprase

18.9ct
15.9 x 15.1 mm
$ 35.99
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Green Seraphinite Gem - 18ct Pear Cabochon (ID: 485991)

Pear Green Seraphinite

18ct
33.6 x 20.7 mm
$ 11.87
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Violet to Blue Color-Change Fluorite Gem - 17.9ct Oval Facet (ID: 413908)

Oval Multicolor Color-Change Fluorite

17.9ct
19.9 x 14.9 mm
$ 358.80
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Multicolor Ammolite Gem - 18.9ct Fancy Cabochon (ID: 494095)

Fancy Multicolor Ammolite

18.9ct
23.2 x 19.1 mm
$ 150.80
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Bi-Color Ametrine Gem - 18.7ct Octagon Step Cut (ID: 461694)

Octagon / Emerald Cut Bi-color Ametrine

18.7ct
15.6 x 15.5 mm
$ 130.62
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Golden Green Sphene Gem - 18.9ct Pear Cabochon (ID: 521616)

Pear Green Sphene

18.9ct
18.6 x 15.1 mm
$ 103.11
Item in Stock
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
man their gems are pretty good, and the prices aren't to bad either, I like checking out hte gems on there website, beceause the pictures of the gems are taken pretty well, and you can see the table, and the facets.
Posted By Spinach in March, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
I love gemselect and I have bought a fair amount from them. The only complaint I have is not being able to save gems. I have a lot of projects so i am in the market for a lot of different gems and it's so disappointing to have to delete them all just to purchase one or two that I have saved in my cart.
Posted By S.Hicks in March, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
I always check this site because they have unique options.
Posted By Lisa in February, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Great website to navigate. Awesome Gem selection! Nice photos and discriptions for all of the gems for sale. You can find gems in all price ranges. Checkout was a breeze.
Posted By Timmy in February, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
They had an extensive gemstone selection in all different cuts, sizes, and colors. They also had very good and workable prices. All of these aspects pulled me in as a customer.
Posted By Josh in February, 2019
Source: Bizrate
Overall Rating -> 9 star ratings
It all depend on the product I will receive and have it verified by my in law jewellers.
Posted By Vodka in February, 2019
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