18 mm Round Gemstones: Natural Rubies, Sapphires, Garnets, Emeralds, Tourmalines, Amethysts in 18mm Round
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Bi-color
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Black
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Blue 18 mm Round Gemstones
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Brown 18 mm Round Gemstones
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Golden
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Gray 18 mm Round Gemstones
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Green 18 mm Round Gemstones
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Multicolor 18 mm Round Gemstones
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Orange
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Pink
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Purple
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Red
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Turquoise
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Violet 18 mm Round Gemstones
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White 18 mm Round Gemstones
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Yellow 18 mm Round Gemstones
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Single |
Pairs |
Lots |
Faceted |
Cabochons |
27.45ct Blue Topaz, Round, VVS-VS
18 mm (calibrated)
$ 205.05
15.26ct Green Serpentine, Round, Translucent
18 mm (calibrated)
$ 27.23
15.94ct Brown Smoky Quartz, Round, VVS
18 mm (calibrated)
$ 64.28
16.42ct Yellow Quartz, Round, VVS
18 mm (calibrated)
$ 72.13
17.43ct Brown Smoky Quartz, Round, VVS
18 mm (calibrated)
$ 57.29
16.29ct Green Quartz, Round, VVS
18 mm (calibrated)
$ 64.78
24.65ct Brown Moonstone, Round, Translucent
18 mm (calibrated)
$ 49.10
24.27ct Multicolor Agate, Round, Opaque
19 mm (calibrated)
$ 24.17
14.85ct Yellow Quartz, Round, VVS
18 mm (calibrated)
$ 59.71
18.67ct Violet Amethyst, Round, VVS-VS
18 mm (calibrated)
$ 130.17
17.63ct White Rainbow Moonstone, Round, Transparent
18 mm (calibrated)
$ 316.07
10.45ct Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 31.22
11.67ct Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 27.31
19.39ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 135.19
18.19ct Violet Amethyst, Round, VS
18 mm (calibrated)
$ 126.82
14.35ct Yellow Quartz, Round, VVS
18 mm (calibrated)
$ 57.70
19.88ct Violet Amethyst, Round, VVS-VS
18 mm (calibrated)
$ 138.60
13.25ct White Agate, Round, Opaque
18 mm (calibrated)
$ 20.98
18.08ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 126.05
29.41ctw Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 69.27
18.40ct Brown Moonstone, Round, Translucent
18 mm (calibrated)
$ 90.72
15.19ct Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 58.25
34.12ctw Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 80.38
48.28ctw Gray Hematite, Round, Opaque
18 mm (calibrated)
$ 47.08
Why Buy 18 Mm Round Gemstones from GemSelect?
- Trusted Worldwide Since 2003
- Supplying natural gemstones to jewelers and collectors in 120+ countries
- Verified natural gemstones
- View All GemSelect Reviews on Bizrate
- Secure checkout and insured worldwide delivery
- 30-day returns and satisfaction guarantee
GemSelect Certified Store Reviews
GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!
Overall Rating -> 10 
I've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.
Overall Rating -> 10
Great selection of gems at a reasonable price
Overall Rating -> 10
Good selection, using for custom jewlery for my wife.
Overall Rating -> 10
Great selection. Maybe too great i kept adding and deleting stuff because i found better looking ones
Overall Rating -> 10
I am filling a small treasure chest and picked a nice amethyst.
Overall Rating -> 10
IT WAS GREAT SIMPLE I WAS ABLE TO MAKE AN ACCOUNT EASY AND WAS ABLE TO FAVORITE ALL OF MY FINAL SELECTED GEMS, I JUST LOVE IT.
