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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (240): Round Shape 12 mm Gems Clear All
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ID: 4080501 pcs
thumb image of 5.5ct Diamond-Cut Brown Smoky Quartz (ID: 408050)
5.46 ct Smoky Quartz
11.9 mm
$ 9.77
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ID: 4166831 pcs
thumb image of 5.3ct Round Checkerboard (double sided) Brown Smoky Quartz (ID: 416683)
5.25 ct Smoky Quartz
12 mm
$ 7.88
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ID: 3876431 pcs
thumb image of 7.6ct Round Facet White Topaz (ID: 387643)
7.63 ct Topaz
12.1 mm
$ 38.15
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ID: 2258161 pcs
thumb image of 8.9ct Round Rose-Cut Black Spinel (ID: 225816)
8.91 ct Spinel
12 mm
$ 44.50
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ID: 3701801 pcs
thumb image of 7.7ct Round Cabochon White Quartz Cat's Eye (ID: 370180)
7.73 ct Quartz Cat's Eye
12 mm
$ 25.12
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ID: 3990571 pcs
thumb image of 5.6ct Round Petal Cut White Quartz (ID: 399057)
5.55 ct Quartz
11.8 mm
$ 8.82
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ID: 4178511 pcs
thumb image of 5.1ct Round Checkerboard (double sided) Lemon Quartz (ID: 417851)
5.07 ct Quartz
11.9 mm
$ 10.14
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ID: 3782692 pcs
thumb image of 12ct Round Rose-Cut Black Spinel (ID: 378269)
11.99 ct Spinel
12 mm
$ 35.97
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ID: 4166841 pcs
thumb image of 5.1ct Round Checkerboard (double sided) Brown Smoky Quartz (ID: 416684)
5.13 ct Smoky Quartz
11.9 mm
$ 7.70
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ID: 4178481 pcs
thumb image of 5.3ct Round Checkerboard (double sided) Lemon Quartz (ID: 417848)
5.33 ct Quartz
12 mm
$ 10.66
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ID: 4087421 pcs
thumb image of 5.7ct Diamond-Cut White Quartz (ID: 408742)
5.67 ct Quartz
12.1 mm
$ 8.79
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ID: 3606311 pcs
thumb image of 8.1ct Round Cabochon White Quartz Cat's Eye (ID: 360631)
8.06 ct Quartz Cat's Eye
12.1 mm
$ 32.24
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ID: 3696201 pcs
thumb image of 7.5ct Round Cabochon White Quartz Cat's Eye (ID: 369620)
7.50 ct Quartz Cat's Eye
12.2 mm
$ 24.30
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ID: 3701811 pcs
thumb image of 7.4ct Round Cabochon White Quartz Cat's Eye (ID: 370181)
7.40 ct Quartz Cat's Eye
12.2 mm
$ 24.05
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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: 3326071 pcs
thumb image of 5.6ct Round Facet Yellow Golden Citrine (ID: 332607)
5.63 ct Citrine
12.1 mm
$ 45.04
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ID: 4302981 pcs
thumb image of 4.4ct Round Cabochon Cream Moonstone (ID: 430298)
4.37 ct Moonstone
11.7 mm
$ 8.61
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ID: 4080951 pcs
thumb image of 6ct Diamond-Cut Brown Smoky Quartz (ID: 408095)
5.97 ct Smoky Quartz
12.3 mm
$ 10.69
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ID: 3844961 pcs
thumb image of 5.7ct Round Rose-Cut Black Spinel (ID: 384496)
5.65 ct Spinel
11.8 mm
$ 16.95
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ID: 4087791 pcs
thumb image of 6.2ct Diamond-Cut White Quartz (ID: 408779)
6.22 ct Quartz
11.8 mm
$ 9.64
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ID: 3606211 pcs
thumb image of 8.1ct Round Cabochon White Quartz Cat's Eye (ID: 360621)
8.13 ct Quartz Cat's Eye
12 mm
$ 32.52
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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