Buy 12 mm Round Calibrated Gemstones from GemSelect
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Bi-color
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Black Round Shape 12 mm Gems
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Blue Round Shape 12 mm Gems
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Brown Round Shape 12 mm Gems
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Golden
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Gray Round Shape 12 mm Gems
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Green Round Shape 12 mm Gems
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Multicolor Round Shape 12 mm Gems
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Orange Round Shape 12 mm Gems
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Pink Round Shape 12 mm Gems
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Purple
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Red Round Shape 12 mm Gems
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Turquoise Round Shape 12 mm Gems
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Violet Round Shape 12 mm Gems
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White Round Shape 12 mm Gems
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Yellow Round Shape 12 mm Gems
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Single |
Pairs |
Lots |
Faceted |
Cabochons |
5.56ct Brown Smoky Quartz, Round, VVS-VS
12 mm (calibrated)
$ 9.13
8.06ct Black Star Diopside, Round, Opaque
12 mm (calibrated)
$ 40.14
5.32ct Brown Smoky Quartz, Round, VVS
12 mm (calibrated)
$ 29.14
5.85ct Brown Smoky Quartz, Round, VS
12 mm (calibrated)
$ 9.62
14.33ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 44.59
4.95ct Brown Smoky Quartz, Round, VVS-VS
12 mm (calibrated)
$ 8.13
13.01ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 40.49
8.50ct White Quartz Cat'S Eye, Round, Transparent
12 mm (calibrated)
$ 30.17
8.14ct White Quartz Cat'S Eye, Round, Transparent
12 mm (calibrated)
$ 35.67
6.46ct Brown Smoky Quartz, Round, VS
13 mm (calibrated)
$ 35.39
6.92ct Blue Larimar, Round, Opaque
12 mm (calibrated)
$ 79.05
14.86ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 48.85
5.33ct Brown Smoky Quartz, Round, VVS
12 mm (calibrated)
$ 17.52
5.13ct Brown Smoky Quartz, Round, VVS-VS
12 mm (calibrated)
$ 8.43
5.66ct Pink Rose Quartz, Round, Transparent
12 mm (calibrated)
$ 22.52
6.73ct Brown Rutile Quartz, Round, Translucent
12 mm (calibrated)
$ 16.88
5.18ct Brown Smoky Quartz, Round, VVS-VS
12 mm (calibrated)
$ 8.52
13.98ct Multicolor Agate, Sphere / Ball, Opaque
12 mm (calibrated)
$ 11.14
6.75ct Brown Tiger'S Eye, Round, Opaque
12 mm (calibrated)
$ 8.75
5.08ct Brown Smoky Quartz, Round, VS
12 mm (calibrated)
$ 8.35
15.28ctw Multicolor Labradorite, Round, Translucent
12 mm (calibrated)
$ 37.13
12.44ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 38.70
5.64ct Pink Rose Quartz, Round, Transparent
12 mm (calibrated)
$ 22.43
5.84ct Brown Smoky Quartz, Round, VVS-VS
12 mm (calibrated)
$ 9.60
Why Buy Round Shape 12 Mm Gems 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 
Enjoy viewing the selections. Excellent product
Overall Rating -> 10
Maneuvering through the website was easy and enjoyable. I have ordered from GemSelect before and that experience was also pleasant.
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
I purchased 4 gemstones in different sizes to be able to make a family ring for my granddaughter. I got exactly what I saw and they are absolutely beautiful! Shipping was quick compared to other gem stores I have dealt with! I will definitely order more stones from your company, as I am a collector and have several stones. You are my new go to company in the future
Overall Rating -> 10
The website was very easy to use.
Overall Rating -> 10
Great prices!!! High quality gemstones.
