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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (368): Round Shape 12 mm Gems Clear All
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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: 3618222 pcs
thumb image of 24.1ct Drilled Sphere Multicolor Jasper (ID: 361822)
24.11 ct Jasper
12.1 mm
$ 24.11
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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: 4012061 pcs
thumb image of 7.3ct Round Petal Cut Brown Smoky Quartz (ID: 401206)
7.27 ct Smoky Quartz
11.9 mm
$ 18.17
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ID: 4473052 pcs
thumb image of 33.8ct Drilled Sphere Blue Kyanite (ID: 447305)
33.84 ct Kyanite
12.3 mm
$ 67.68
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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: 4473062 pcs
thumb image of 31.9ct Drilled Sphere Blue Kyanite (ID: 447306)
31.86 ct Kyanite
12.3 mm
$ 63.72
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ID: 4473012 pcs
thumb image of 31.6ct Drilled Sphere Blue Kyanite (ID: 447301)
31.57 ct Kyanite
11.9 mm
$ 63.14
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ID: 4473042 pcs
thumb image of 30.2ct Drilled Sphere Blue Kyanite (ID: 447304)
30.22 ct Kyanite
11.9 mm
$ 60.44
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ID: 3335701 pcs
thumb image of 12.4ct Spherical Golden Pearl (ID: 333570)
12.37 ct Pearl
12.1 mm
$ 252.60
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ID: 4473072 pcs
thumb image of 30.2ct Drilled Sphere Blue Kyanite (ID: 447307)
30.19 ct Kyanite
11.8 mm
$ 60.38
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ID: 4473082 pcs
thumb image of 29.5ct Drilled Sphere Blue Kyanite (ID: 447308)
29.51 ct Kyanite
11.8 mm
$ 59.02
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ID: 4473032 pcs
thumb image of 29.4ct Drilled Sphere Blue Kyanite (ID: 447303)
29.42 ct Kyanite
11.8 mm
$ 58.84
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ID: 4473101 pcs
thumb image of 15.1ct Drilled Sphere Blue Kyanite (ID: 447310)
15.12 ct Kyanite
11.9 mm
$ 30.24
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ID: 3335741 pcs
thumb image of 11.5ct Spherical Silver Pearl (ID: 333574)
11.50 ct Pearl
12.2 mm
$ 115.00
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ID: 4229652 pcs
thumb image of 23.8ct Drilled Sphere Gold Brown Tiger's Eye (ID: 422965)
23.77 ct Tiger's Eye
11.9 mm
$ 19.02
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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: 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: 4383782 pcs
thumb image of 13.8ct Round Rose-Cut Black Spinel (ID: 438378)
13.79 ct Spinel
12 mm
$ 41.37
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ID: 4388531 pcs
thumb image of 6.3ct Round Rose-Cut Black Spinel (ID: 438853)
6.30 ct Spinel
12 mm
$ 18.90
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ID: 4176872 pcs
thumb image of 10.6ct Round Checkerboard (double sided) Lemon Quartz (ID: 417687)
10.63 ct Quartz
11.9 mm
$ 21.26
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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