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 |
5.78ct Brown Smoky Quartz, Round, Transparent
12 mm (calibrated)
$ 24.25
14.10ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 43.87
5.11ct Multicolor Mystic Quartz, Round, VS
12 mm (calibrated)
$ 12.72
8.36ct White Quartz Cat'S Eye, Round, Transparent
12 mm (calibrated)
$ 29.68
12.26ct Brown Tiger'S Eye, Sphere / Ball, Opaque
12 mm (calibrated)
$ 12.31
5.38ct Brown Rutile Quartz, Round, Transparent
12 mm (calibrated)
$ 13.50
7.37ct White Quartz, Round, VVS-VS
12 mm (calibrated)
$ 12.91
13.30ct Brown Pearl, Sphere / Ball, Opaque
12 mm (calibrated)
$ 218.57
12.21ctw Multicolor Labradorite, Round, Translucent
12 mm (calibrated)
$ 26.26
7.30ct White Quartz Cat'S Eye, Round, Transparent
12 mm (calibrated)
$ 31.99
5.96ct Brown Rutile Quartz, Round, Transparent
12 mm (calibrated)
$ 14.96
14.65ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 45.71
14.69ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 48.29
15.94ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 52.39
9.53ct Multicolor Agate, Round, Opaque
12 mm (calibrated)
$ 9.50
5.73ct Brown Smoky Quartz, Round, VVS-VS
12 mm (calibrated)
$ 9.42
11.63ctw Yellow Quartz, Round, VVS
12 mm (calibrated)
$ 51.09
13.48ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 44.31
7.68ct Green Maw-Sit-Sit, Round, Opaque
12 mm (calibrated)
$ 25.24
7.03ct Blue Larimar, Round, Opaque
12 mm (calibrated)
$ 73.02
6.28ctw Multicolor Pietersite, Round, Opaque
12 mm (calibrated)
$ 14.70
13.90ctw Green Jadeite, Round, Translucent
12 mm (calibrated)
$ 45.68
5.43ct Brown Smoky Quartz, Round, VVS
12 mm (calibrated)
$ 14.88
13.93ctw Black Spinel, Round, Opaque
12 mm (calibrated)
$ 45.78
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 -> 9 
Everything was good, the purchase was what I expected and what they show is what you get.
Overall Rating -> 10 
I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.
Overall Rating -> 7 
Could not get it to work 25 times.
Overall Rating -> 10
Love this website! Looking forward to ordering consistently throughout the years to come building a personal collection.
Overall Rating -> 8 
Site worked well and helped me find a rock that matched what I was looking for. Well within budget and I trust it will show up, so that's definitely positive. Not much else to it. Satisfied.
Overall Rating -> 10
I love the products. I've bought them as gifts and people love my gifts
