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You Selected (375): Round Shape 12 mm Gems Clear All
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ID: 4176862 pcs
thumb image of 10.2ct Round Checkerboard (double sided) Lemon Quartz (ID: 417686)
10.20 ct Quartz
12 mm
$ 20.40
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ID: 4383752 pcs
thumb image of 15.4ct Round Rose-Cut Black Spinel (ID: 438375)
15.39 ct Spinel
12.2 mm
$ 46.17
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ID: 4489791 pcs
thumb image of 5.4ct Round Cabochon Red Brown Rutile Quartz (ID: 448979)
5.39 ct Rutile Quartz
12 mm
$ 13.48
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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: 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: 4176812 pcs
thumb image of 10.7ct Round Checkerboard (double sided) Lemon Quartz (ID: 417681)
10.65 ct Quartz
12 mm
$ 21.30
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ID: 2830191 pcs
thumb image of 5.8ct Round Cabochon Smoky Brown Smoky Quartz (ID: 283019)
5.82 ct Smoky Quartz
12.2 mm
$ 7.28
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ID: 2830171 pcs
thumb image of 5.6ct Round Cabochon Smoky Brown Smoky Quartz (ID: 283017)
5.63 ct Smoky Quartz
11.9 mm
$ 7.04
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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: 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: 2830141 pcs
thumb image of 6.7ct Round Cabochon Smoky Brown Smoky Quartz (ID: 283014)
6.70 ct Smoky Quartz
12.1 mm
$ 8.38
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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: 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: 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: 3618262 pcs
thumb image of 23.8ct Drilled Sphere Multicolor Jasper (ID: 361826)
23.84 ct Jasper
12.1 mm
$ 23.84
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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: 3237681 pcs
thumb image of 8.2ct Round Cabochon Smoky Brown Smoky Quartz (ID: 323768)
8.18 ct Smoky Quartz
12.3 mm
$ 6.95
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ID: 4349702 pcs
thumb image of 23.7ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 434970)
23.69 ct Rutile Quartz
11.9 mm
$ 23.69
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ID: 3382151 pcs
thumb image of 13.6ct Spherical Silver Pearl (ID: 338215)
13.55 ct Pearl
12.3 mm
$ 203.25
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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: 4384972 pcs
thumb image of 14.2ct Round Rose-Cut Black Spinel (ID: 438497)
14.23 ct Spinel
12 mm
$ 42.69
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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