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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (574): Round Shape 12 mm Gems Clear All
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5.9ct Round Facet Red Strawberry Quartz Gem (ID: 475301)
5.85 ct Strawberry Quartz
12 mm
$ 40.95
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5.8ct Round Facet Green Prehnite Gem (ID: 248654)
5.78 ct (total 11.55ctw) Prehnite
12 mm
$ 51.98
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7.8ct Round Cabochon White Quartz Cat's Eye Gem (ID: 360634)
7.77 ct Quartz Cat's Eye
11.8 mm
$ 31.08
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13.6ct Spherical Silver Pearl Gem (ID: 338281)
13.62 ct Pearl
12.4 mm
$ 204.30
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13ct Spherical Golden Pearl Gem (ID: 335849)
13.02 ct Pearl
12.3 mm
$ 265.74
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13ct Spherical Silver Pearl Gem (ID: 338212)
13.04 ct Pearl
12.3 mm
$ 195.60
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9.1ct Round Cabochon Deep Brown Cat's Eye Scapolite Gem (ID: 470428)
9.14 ct Cat's Eye Scapolite
11.8 mm
$ 45.70
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11.9ct Drilled Sphere Colorless Golden Rutile Quartz Gem (ID: 435058)
11.90 ct (total 23.79ctw) Rutile Quartz
12 mm
$ 23.79
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7.4ct Round Rose-Cut Black Spinel Gem (ID: 438489)
7.35 ct (total 14.70ctw) Spinel
12.1 mm
$ 44.10
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12.3ct Drilled Sphere Multicolor Jasper Gem (ID: 361821)
12.29 ct (total 24.57ctw) Jasper
12.2 mm
$ 24.57
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13.1ct Drilled Sphere Multicolor Jasper Gem (ID: 361823)
13.09 ct (total 26.18ctw) Jasper
12.3 mm
$ 26.18
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12.4ct Drilled Sphere Multicolor Jasper Gem (ID: 361817)
12.41 ct (total 24.81ctw) Jasper
12.3 mm
$ 24.81
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13ct Drilled Sphere Multicolor Jasper Gem (ID: 361815)
12.97 ct (total 25.94ctw) Jasper
12.3 mm
$ 25.94
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11.9ct Drilled Sphere Multicolor Jasper Gem (ID: 361826)
11.92 ct (total 23.84ctw) Jasper
12.1 mm
$ 23.84
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5.2ct Round Checkerboard (double sided) Lemon Quartz Gem (ID: 417688)
5.22 ct (total 10.44ctw) Quartz
12 mm
$ 20.88
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12.6ct Drilled Sphere Multicolor Jasper Gem (ID: 361819)
12.61 ct (total 25.21ctw) Jasper
12.3 mm
$ 25.21
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13ct Drilled Sphere Gold Brown Tiger's Eye Gem (ID: 422962)
13.01 ct (total 26.02ctw) Tiger's Eye
12.2 mm
$ 20.82
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11.3ct Drilled Sphere Multicolor Jasper Gem (ID: 361820)
11.32 ct (total 22.63ctw) Jasper
11.9 mm
$ 22.63
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13.8ct Drilled Sphere Colorless Golden Rutile Quartz Gem (ID: 435118)
13.80 ct (total 27.60ctw) Rutile Quartz
12.3 mm
$ 27.60
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13.3ct Spherical Golden Pearl Gem (ID: 335853)
13.34 ct Pearl
12.4 mm
$ 200.10
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12.8ct Drilled Sphere Gold Brown Tiger's Eye Gem (ID: 422964)
12.84 ct (total 25.67ctw) Tiger's Eye
11.6 mm
$ 20.54
Item in Stock
Round Shape 12 mm Gems
Some people by gems by color or price, but for many, it is best to buy gems by shape and size - especially if you're in need of a gem to replace a previous item that was lost or damaged. Calibrated Round shapes, facet cut and cabochon gems available now in 12 mm diameter size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. For calibrated gemstones weighing under one carat, most jewelry settings will accommodate a gem which is within 0.2 mm of the calibrated size in order to fit a standard setting. For gemstones that weigh over one carat, a larger variance is acceptable, often around 0.3 mm or slightly higher even. This small variance can usually be accommodated for standard style settings. Round-cut gemstones should also have a greater variance in acceptable size when it comes to calibration; in fact it is usually possible to mount a round stone of any size in the closest standard setting.

Certified Customer Reviews
Overall Rating -> 10 star ratings
The site had so many different stones and they were very affordably priced
Posted By Manimal in December, 2018
Source: Bizrate
Overall Rating -> 9 star ratings
Good stones and easy to use website
Posted By Wilsondesigns in December, 2018
Source: Bizrate
Overall Rating -> 9 star ratings
All is good
Posted By T in December, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
nice collection of jewels at a fair price
Posted By Bob in December, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
The website is easy to use, and there is a wonderful selection of gem stones to choose from. The prices are reasonable.
Posted By LoveGems in December, 2018
Source: Bizrate
Overall Rating -> 9 star ratings
simple, clear, well organized site
Posted By Lleb in December, 2018
Source: Bizrate
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart