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 |
17.43ct Brown Smoky Quartz, Round, VVS
18 mm (calibrated)
$ 57.29
15.26ct Green Serpentine, Round, Translucent
18 mm (calibrated)
$ 27.23
16.29ct Green Quartz, Round, VVS
18 mm (calibrated)
$ 64.78
27.45ct Blue Topaz, Round, VVS-VS
18 mm (calibrated)
$ 205.05
15.94ct Brown Smoky Quartz, Round, VVS
18 mm (calibrated)
$ 64.28
16.42ct Yellow Quartz, Round, VVS
18 mm (calibrated)
$ 72.13
24.65ct Brown Moonstone, Round, Translucent
18 mm (calibrated)
$ 49.10
34.12ctw Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 80.38
29.41ctw Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 69.27
18.76ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 130.79
23.98ct Brown Moonstone, Round, Translucent
18 mm (calibrated)
$ 52.55
15.09ct Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 57.87
17.63ct White Rainbow Moonstone, Round, Transparent
18 mm (calibrated)
$ 316.07
15.19ct Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 58.25
19.14ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 133.45
15.46ct Brown Smoky Quartz, Round, VVS-VS
18 mm (calibrated)
$ 62.33
18.89ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 131.70
18.19ct Violet Amethyst, Round, VS
18 mm (calibrated)
$ 126.82
18.88ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 131.63
24.27ct Multicolor Agate, Round, Opaque
19 mm (calibrated)
$ 24.17
19.33ct Violet Amethyst, Round, VVS-VS
18 mm (calibrated)
$ 134.77
21.98ct Brown Moonstone, Round, Translucent
18 mm (calibrated)
$ 48.16
19.60ct Violet Amethyst, Round, VVS-VS
18 mm (calibrated)
$ 136.65
18.58ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 129.54
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 
The process was pleasant, I chose to purchase the stone traditional to the month of March as it is the month in which I was born.
Overall Rating -> 10
I have made many purchases from GemSelect over the years, and I have a beautiful collection of jewelry as a result. My purchases have always been exactly as described, and I have enjoyed doing business with you.
Overall Rating -> 10
the selection is good as are the prices
Overall Rating -> 8 
I've purchased things from GemSelect before. What you see is what you get, which is not always the case with gem sites online. You can find some good value with gem select, and I will buy from them again.
Overall Rating -> 10
selection was broad and the check out was quick. Great site
Overall Rating -> 9 
Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly
