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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (399): Round Shape 12 mm Gems Clear All
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ID: 4640241 pcs
thumb image of 5.7ct Round Facet Brown Smoky Quartz (ID: 464024)
5.73 ct Smoky Quartz
12 mm
$ 8.60
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ID: 4704281 pcs
thumb image of 9.1ct Round Cabochon Deep Brown Cat's Eye Scapolite (ID: 470428)
9.14 ct Cat's Eye Scapolite
11.8 mm
$ 45.70
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ID: 4351182 pcs
thumb image of 27.6ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 435118)
27.60 ct Rutile Quartz
12.3 mm
$ 27.60
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ID: 4182521 pcs
thumb image of 6.2ct Round Cabochon Cream Star Moonstone (ID: 418252)
6.23 ct Star Moonstone
12 mm
$ 24.92
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ID: 3701831 pcs
thumb image of 7.2ct Round Cabochon White Quartz Cat's Eye (ID: 370183)
7.19 ct Quartz Cat's Eye
11.9 mm
$ 23.37
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ID: 2715711 pcs
thumb image of 5.8ct Round Facet Green Prehnite (ID: 271571)
5.76 ct Prehnite
12 mm
$ 25.92
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ID: 4705882 pcs
thumb image of 16.1ct Round Cabochon Green Jadeite (ID: 470588)
16.07 ct Jadeite
12.2 mm
$ 48.21
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ID: 3844902 pcs
thumb image of 13.2ct Round Rose-Cut Black Spinel (ID: 384490)
13.20 ct Spinel
12 mm
$ 39.60
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ID: 4705982 pcs
thumb image of 16.1ct Round Cabochon Green Jadeite (ID: 470598)
16.12 ct Jadeite
12.1 mm
$ 48.36
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ID: 4229622 pcs
thumb image of 26ct Drilled Sphere Gold Brown Tiger's Eye (ID: 422962)
26.02 ct Tiger's Eye
12.2 mm
$ 20.82
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ID: 4350582 pcs
thumb image of 23.8ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 435058)
23.79 ct Rutile Quartz
12 mm
$ 23.79
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ID: 3782802 pcs
thumb image of 13.8ct Round Rose-Cut Black Spinel (ID: 378280)
13.84 ct Spinel
11.8 mm
$ 41.52
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ID: 3335611 pcs
thumb image of 13.1ct Spherical Golden Pearl (ID: 333561)
13.12 ct Pearl
12.3 mm
$ 267.91
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ID: 3618212 pcs
thumb image of 24.6ct Drilled Sphere Multicolor Jasper (ID: 361821)
24.57 ct Jasper
12.2 mm
$ 24.57
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ID: 4706701 pcs
thumb image of 6.8ct Round Cabochon Green Jadeite (ID: 470670)
6.80 ct Jadeite
12 mm
$ 20.40
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ID: 4705862 pcs
thumb image of 13.9ct Round Cabochon Green Jadeite (ID: 470586)
13.90 ct Jadeite
11.8 mm
$ 41.70
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ID: 4383732 pcs
thumb image of 14.9ct Round Rose-Cut Black Spinel (ID: 438373)
14.92 ct Spinel
12.1 mm
$ 44.76
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ID: 4348082 pcs
thumb image of 23.3ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 434808)
23.25 ct Rutile Quartz
11.7 mm
$ 23.25
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ID: 4176491 pcs
thumb image of 5ct Diamond-Cut White Quartz (ID: 417649)
5.04 ct Quartz
12 mm
$ 8.06
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ID: 4383712 pcs
thumb image of 14.9ct Round Rose-Cut Black Spinel (ID: 438371)
14.85 ct Spinel
12 mm
$ 44.55
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ID: 4737741 pcs
thumb image of 9.1ct Round Cabochon White Cat's Eye Moonstone (ID: 473774)
9.06 ct Cat's Eye Moonstone
12.1 mm
$ 36.24
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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.

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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