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 |
5.77ct Brown Rutile Quartz, Round, Translucent
12 mm (calibrated)
$ 14.48
15.15ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 49.80
6.38ct Brown Smoky Quartz, Round, VVS
12 mm (calibrated)
$ 7.62
10.97ct Gray Star Sapphire, Round, Opaque
12 mm (calibrated)
$ 420.66
6.84ct Brown Tiger'S Eye, Round, Opaque
12 mm (calibrated)
$ 8.86
9.43ctw Multicolor Labradorite, Round, Translucent
12 mm (calibrated)
$ 20.67
6.16ct Yellow Citrine, Round, VVS
12 mm (calibrated)
$ 47.24
12.77ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 39.74
14.18ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 46.60
11.38ct White Rutile Quartz, Sphere / Ball, Translucent
12 mm (calibrated)
$ 13.10
10.25ctw Brown Smoky Quartz, Round, VS
12 mm (calibrated)
$ 33.70
13.73ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 45.13
10.73ct Red Star Garnet, Round, Opaque
12 mm (calibrated)
$ 10.57
6.50ct Black Cat'S Eye Scapolite, Round, Translucent
12 mm (calibrated)
$ 35.61
10.95ct Black Star Diopside, Round, Opaque
12 mm (calibrated)
$ 54.53
6.13ct Multicolor Pietersite, Round, Opaque
12 mm (calibrated)
$ 12.37
7.24ct Pink Morganite, Round, Translucent
12 mm (calibrated)
$ 78.53
7.30ct Brown Tiger'S Eye, Round, Opaque
12 mm (calibrated)
$ 9.45
14.78ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 48.57
5.53ct Brown Smoky Quartz, Round, VVS
12 mm (calibrated)
$ 10.85
5.91ct Yellow Citrine, Round, VVS
12 mm (calibrated)
$ 45.33
13.01ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 40.49
7.66ct Multicolor Agate, Round, Opaque
12 mm (calibrated)
$ 12.96
5.29ct Yellow Quartz, Round, VVS
12 mm (calibrated)
$ 21.26
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 
Great! Affordable
Overall Rating -> 10
I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.
Overall Rating -> 9 
Fast snd easy to find what I was looking for
Overall Rating -> 9
Fast and reliable service.
Overall Rating -> 10
On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc
Overall Rating -> 10
Love the precise descriptions and calibrations of hte loose gemstones. Would like to have seen more variety in the size gem I was looking for.
