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 |
5.06ct Pink Rose Quartz, Round, Transparent
12 mm (calibrated)
$ 20.13
5.50ct Pink Rose Quartz, Round, Transparent
12 mm (calibrated)
$ 21.88
24.11ctw Multicolor Jasper, Sphere / Ball, Opaque
12 mm (calibrated)
$ 26.41
5.24ct Brown Smoky Quartz, Round, VS
12 mm (calibrated)
$ 8.62
6.09ct Yellow Quartz, Round, VVS
12 mm (calibrated)
$ 26.75
7.51ct White Quartz Cat'S Eye, Round, Transparent
12 mm (calibrated)
$ 26.74
4.90ct Brown Smoky Quartz, Round, VS
12 mm (calibrated)
$ 8.06
7.56ct White Quartz Cat'S Eye, Round, Transparent
12 mm (calibrated)
$ 26.93
4.94ct Brown Smoky Quartz, Round, VVS-VS
12 mm (calibrated)
$ 27.06
5.41ct Yellow Quartz, Round, VVS
12 mm (calibrated)
$ 29.64
12.72ct White Rutile Quartz, Sphere / Ball, Translucent
12 mm (calibrated)
$ 14.64
22.63ctw Multicolor Jasper, Sphere / Ball, Opaque
12 mm (calibrated)
$ 24.79
13.49ct Gray Pearl, Sphere / Ball, Opaque
12 mm (calibrated)
$ 218.02
14.84ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 48.77
13.47ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 44.27
5.59ct Yellow Quartz, Round, Transparent
12 mm (calibrated)
$ 22.17
6.76ct Brown Smoky Quartz, Round, VVS-VS
12 mm (calibrated)
$ 18.52
5.44ct Yellow Citrine, Round, VS
12 mm (calibrated)
$ 47.68
4.70ct Brown Smoky Quartz, Round, VS
12 mm (calibrated)
$ 7.73
5.31ct Yellow Quartz, Round, Transparent
12 mm (calibrated)
$ 21.06
12.77ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 39.74
6.40ct Brown Smoky Quartz, Round, VVS-VS
12 mm (calibrated)
$ 7.65
6.13ct Multicolor Pietersite, Round, Opaque
12 mm (calibrated)
$ 12.37
5.45ct Brown Smoky Quartz, Round, VVS
12 mm (calibrated)
$ 17.92
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 
Although the stones are smaller than I thought, I really don't think in millimeters, they are perfect. I plan to put one into a ring and the other into a necklace. Ordering was easy, contact kept me aware of how shipping was going, and delivery was sooner than expected. The quality of stones I have ordered in the past and this recent order is outstanding and stones I will be proud to wear.
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 was able to find what I wanted very easily!
Overall Rating -> 9 
I do enjoy this website and the wide selection. I would like to see more untreated stones. I also wasn't able to see my past order when I logged in.
Overall Rating -> 10
I have been very happy with my prior purchases and enjoy the website experience.
Overall Rating -> 10
Great prices!!! High quality gemstones.
