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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (361): Round Shape 12 mm Gems Clear All
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ID: 4639801 pcs
thumb image of 5ct Round Facet Brown Smoky Quartz (ID: 463980)
4.95 ct Smoky Quartz
11.7 mm
$ 7.43
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ID: 4384922 pcs
thumb image of 13.8ct Round Rose-Cut Black Spinel (ID: 438492)
13.75 ct Spinel
11.8 mm
$ 41.25
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ID: 4639651 pcs
thumb image of 5.1ct Round Facet Brown Smoky Quartz (ID: 463965)
5.13 ct Smoky Quartz
11.7 mm
$ 7.70
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ID: 3618162 pcs
thumb image of 22.5ct Drilled Sphere Multicolor Jasper (ID: 361816)
22.48 ct Jasper
12 mm
$ 22.48
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ID: 2830971 pcs
thumb image of 6.8ct Round Cabochon Smoky Brown Smoky Quartz (ID: 283097)
6.79 ct Smoky Quartz
12.1 mm
$ 8.49
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ID: 2830201 pcs
thumb image of 6.8ct Round Cabochon Smoky Brown Smoky Quartz (ID: 283020)
6.82 ct Smoky Quartz
12.1 mm
$ 8.52
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ID: 4187561 pcs
thumb image of 7.7ct Round Cabochon Cream Peach Star Moonstone (ID: 418756)
7.66 ct Star Moonstone
12 mm
$ 30.64
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ID: 3207141 pcs
thumb image of 6.2ct Round Cabochon Smoky Brown Smoky Quartz (ID: 320714)
6.24 ct Smoky Quartz
12.3 mm
$ 7.49
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ID: 4645481 pcs
thumb image of 3.1ct Round Cabochon Blue Turquoise (ID: 464548)
3.08 ct Turquoise
12 mm
$ 6.16
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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: 3291021 pcs
thumb image of 4.8ct Round Facet Yellow Golden Citrine (ID: 329102)
4.79 ct Citrine
12.1 mm
$ 34.20
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ID: 2829761 pcs
thumb image of 6.3ct Round Cabochon Smoky Brown Smoky Quartz (ID: 282976)
6.31 ct Smoky Quartz
11.9 mm
$ 7.89
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ID: 4384342 pcs
thumb image of 14.5ct Round Rose-Cut Black Spinel (ID: 438434)
14.47 ct Spinel
12 mm
$ 43.41
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ID: 3694332 pcs
thumb image of 15.4ct Round Cabochon White Quartz Cat's Eye (ID: 369433)
15.44 ct Quartz Cat's Eye
11.8 mm
$ 50.03
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ID: 4012081 pcs
thumb image of 6.6ct Round Petal Cut Brown Smoky Quartz (ID: 401208)
6.58 ct Smoky Quartz
12 mm
$ 16.45
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ID: 3694292 pcs
thumb image of 16.7ct Round Cabochon White Quartz Cat's Eye (ID: 369429)
16.66 ct Quartz Cat's Eye
12 mm
$ 53.98
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ID: 2830701 pcs
thumb image of 7ct Round Cabochon Smoky Brown Smoky Quartz (ID: 283070)
6.99 ct Smoky Quartz
12.3 mm
$ 8.74
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ID: 4384291 pcs
thumb image of 7.5ct Round Rose-Cut Black Spinel (ID: 438429)
7.51 ct Spinel
12 mm
$ 22.53
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ID: 4639701 pcs
thumb image of 5.4ct Round Facet Brown Smoky Quartz (ID: 463970)
5.44 ct Smoky Quartz
11.8 mm
$ 8.16
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ID: 4384982 pcs
thumb image of 12.6ct Round Rose-Cut Black Spinel (ID: 438498)
12.64 ct Spinel
11.9 mm
$ 37.92
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ID: 3237712 pcs
thumb image of 13.3ct Round Cabochon Smoky Brown Smoky Quartz (ID: 323771)
13.32 ct Smoky Quartz
12 mm
$ 11.32
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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