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Buy 18 Carat Gems

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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (402): 18 Carat Gems Clear All
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Mandarin Orange Citrine Gem - 18.9ct Round Facet (ID: 340007)

Round Orange Citrine

18.9ct
17.9 mm
$ 133.32
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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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Multicolor Jasper Gem - 18.3ct Oval Cabochon (ID: 363299)

Oval Multicolor Jasper

18.3ct
25 x 18.2 mm
$ 36.62
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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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Pink Rose Quartz Gem - 17.8ct Carved Fish (ID: 345248)

Fancy Pink Rose Quartz

17.8ct
21.7 x 17.4 mm
$ 20.64
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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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Yellow Golden Citrine Gem - 17.7ct Octagon Step Cut (ID: 503452)

Octagon / Emerald Cut Yellow Citrine

17.7ct
18.1 x 13.2 mm
$ 105.02
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Colorless Golden Rutile Quartz Gem - 18ct Round Cabochon (ID: 395601)

Round Yellow 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 Golden Rutile Quartz Gem - 18.5ct Oval Cabochon (ID: 402347)

Oval Yellow 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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Pink Kunzite Gem - 18ct Cushion-Cut (ID: 427409)

Cushion Pink Kunzite

18ct
14.1 x 14 mm
$ 324.18
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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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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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Multicolor Bloodstone Gem - 18.4ct Pencil (ID: 485113)

Fancy Multicolor Bloodstone

18.4ct
29.2 x 9.2 mm
$ 80.19
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Multicolor Sugilite Gem - 18.7ct Pear Cabochon (ID: 482503)

Pear Multicolor Sugilite

18.7ct
22.3 x 15.1 mm
$ 93.25
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Blue Larimar Gem - 18.2ct Pear Cabochon (ID: 447380)

Pear Blue Larimar

18.2ct
29.1 x 17.6 mm
$ 182.40
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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
I love that I was able to find a site that offers REAL gemstones. I love the pictures provided of the gems so I can look at each one from different angles, I love the variety of gems on the site & I love the ability to narrow down my search to look at certain gems that fit my criteria.
Posted By Risuna in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Always a pleasure to do business with you. Gems have always been as pictured, certificate option is appreciated.
Posted By Lawrencekramer in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
My experience with gemselect was awesome so far. I had a few questions about their website and making orders and they replied quickly and were happy to help. I have not received the items I ordered yet as I just ordered them this morning. Although, I truly feel I am going to be a very happy customer once I do receive my items. Gemselect guarantees all their items and have a great return policy just incase. The have a vast selection of all kinds of stones and not to mention their prices are much better than some other websites. Thanks Gemselect I’ll be doing business here from now on!
Posted By Jpapaleo in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
I was very happy on the quality of the gemstones I recieved from GemSelect, I will deffinetly buy again.
Posted By Mckeg in January, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Great, easy to use, efficient!
Posted By Olive in January, 2019
Source: Bizrate
Overall Rating -> 9 star ratings
Great selection. Love the many learning features like articles and gem information. Prices competitive for natural stones. I do miss not having a selection of lab-made stones, CZ’s, etc, which are useful when price and cost are factors.
Posted By Dirk in January, 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