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 |
18.08ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 126.05
18.92ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 131.91
10.45ct Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 31.22
18.40ct Brown Moonstone, Round, Translucent
18 mm (calibrated)
$ 90.72
19.76ct Violet Amethyst, Round, VVS-VS
18 mm (calibrated)
$ 137.76
48.28ctw Gray Hematite, Round, Opaque
18 mm (calibrated)
$ 47.08
19.78ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 137.90
17.29ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 120.55
11.67ct Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 27.31
19.21ct Violet Amethyst, Round, VS
18 mm (calibrated)
$ 133.93
58.13ctw Gray Hematite, Round, Opaque
18 mm (calibrated)
$ 56.68
14.35ct Yellow Quartz, Round, VVS
18 mm (calibrated)
$ 57.70
48.88ctw Gray Hematite, Round, Opaque
18 mm (calibrated)
$ 47.66
13.11ct Multicolor Coral, Round, Translucent
18 mm (calibrated)
$ 43.09
19.88ct Violet Amethyst, Round, VVS-VS
18 mm (calibrated)
$ 138.60
11.91ct Multicolor Coral, Round, Translucent
18 mm (calibrated)
$ 26.10
14.85ct Yellow Quartz, Round, VVS
18 mm (calibrated)
$ 59.71
18.67ct Violet Amethyst, Round, VVS-VS
18 mm (calibrated)
$ 130.17
23.89ct Brown Moonstone, Round, Translucent
18 mm (calibrated)
$ 52.35
15.97ct White Agate, Round, Opaque
18 mm (calibrated)
$ 25.29
19.39ct Violet Amethyst, Round, VVS
18 mm (calibrated)
$ 135.19
13.25ct White Agate, Round, Opaque
18 mm (calibrated)
$ 20.98
12.37ct Multicolor Pietersite, Round, Opaque
18 mm (calibrated)
$ 30.31
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 -> 8 
I visited several online loose stone shops trying to find rare stones. I finally found one that I've been looking for here, and very satisfied. Looking forward to receive the item in 3 weeks.
Overall Rating -> 10 
My current project is something BLUE . Opal earrings with matching tennis bracelet for her wedding. The opals and sixty two sapphires VVS & VS are AMAZINGLY BEAUTIFUL. The private jewelers were impressed by the clarity and inclusion free of the sapphires . I want to say thank you for the High quality sapphires that I purchased for my daughtera's wedding.
Overall Rating -> 10
It was great
Overall Rating -> 10
I feel Gemselect is a trustworthy company to buy from
Overall Rating -> 8
The website was easy to use and there were a lot of good options, I was satisfied.
Overall Rating -> 9 
Very easy to navigate with a great selection.
