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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: 4384992 pcs
thumb image of 15ct Round Rose-Cut Black Spinel (ID: 438499)
14.99 ct Spinel
12.1 mm
$ 44.97
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ID: 4384372 pcs
thumb image of 13ct Round Cabochon Black Spinel (ID: 438437)
12.99 ct Spinel
11.9 mm
$ 38.97
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ID: 2830651 pcs
thumb image of 5.6ct Round Cabochon Smoky Brown Smoky Quartz (ID: 283065)
5.62 ct Smoky Quartz
12.1 mm
$ 7.02
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ID: 3335581 pcs
thumb image of 13.3ct Spherical Golden Pearl (ID: 333558)
13.25 ct Pearl
12.3 mm
$ 270.56
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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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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: 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: 4384902 pcs
thumb image of 15.3ct Round Rose-Cut Black Spinel (ID: 438490)
15.28 ct Spinel
12 mm
$ 45.84
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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: 4229662 pcs
thumb image of 25.3ct Drilled Sphere Gold Brown Tiger's Eye (ID: 422966)
25.27 ct Tiger's Eye
12.1 mm
$ 20.22
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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: 4176882 pcs
thumb image of 10.4ct Round Checkerboard (double sided) Lemon Quartz (ID: 417688)
10.44 ct Quartz
12 mm
$ 20.88
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ID: 3618192 pcs
thumb image of 25.2ct Drilled Sphere Multicolor Jasper (ID: 361819)
25.21 ct Jasper
12.3 mm
$ 25.21
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ID: 2830671 pcs
thumb image of 7.5ct Round Cabochon Smoky Brown Smoky Quartz (ID: 283067)
7.52 ct Smoky Quartz
12.2 mm
$ 9.40
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ID: 4321321 pcs
thumb image of 7.6ct Round Petal Cut Brown Smoky Quartz (ID: 432132)
7.59 ct Smoky Quartz
12.2 mm
$ 12.90
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ID: 3385601 pcs
thumb image of 4.5ct Round Facet Yellow Golden Citrine (ID: 338560)
4.47 ct Citrine
11.9 mm
$ 37.55
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ID: 4384392 pcs
thumb image of 12.1ct Round Rose-Cut Black Spinel (ID: 438439)
12.10 ct Spinel
12 mm
$ 36.30
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ID: 4208961 pcs
thumb image of 8.7ct Round Cabochon Cream Star Moonstone (ID: 420896)
8.73 ct Star Moonstone
12.1 mm
$ 26.19
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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: 4176822 pcs
thumb image of 10.6ct Round Checkerboard (double sided) Lemon Quartz (ID: 417682)
10.61 ct Quartz
12 mm
$ 21.22
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ID: 4166781 pcs
thumb image of 5.2ct Round Checkerboard (double sided) Brown Smoky Quartz (ID: 416678)
5.17 ct Smoky Quartz
12.1 mm
$ 7.76
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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