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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (432): Round Shape 12 mm Gems Clear All
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ID: 3385551 pcs
thumb image of 5.8ct Round Facet Yellow Golden Citrine (ID: 338555)
5.78 ct Citrine
12 mm
$ 46.24
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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: 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: 3701851 pcs
thumb image of 7.6ct Round Cabochon White Quartz Cat's Eye (ID: 370185)
7.57 ct Quartz Cat's Eye
12.1 mm
$ 24.60
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ID: 4348082 pcs
thumb image of 23.3ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 434808)
23.25 ct Rutile Quartz
11.7 mm
$ 23.25
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ID: 4737741 pcs
thumb image of 9.1ct Round Cabochon White Cat's Eye Moonstone (ID: 473774)
9.06 ct Cat's Eye Moonstone
12.1 mm
$ 36.24
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ID: 4669622 pcs
thumb image of 25.7ct Drilled Sphere Blue Lapis Lazuli (ID: 466962)
25.66 ct Lapis Lazuli
12 mm
$ 25.66
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ID: 4669412 pcs
thumb image of 25.7ct Drilled Sphere Blue Lapis Lazuli (ID: 466941)
25.71 ct Lapis Lazuli
12.1 mm
$ 25.71
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ID: 4669591 pcs
thumb image of 13.3ct Drilled Sphere Blue Lapis Lazuli (ID: 466959)
13.32 ct Lapis Lazuli
12.1 mm
$ 13.32
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ID: 4669442 pcs
thumb image of 25.8ct Drilled Sphere Blue Lapis Lazuli (ID: 466944)
25.75 ct Lapis Lazuli
12.1 mm
$ 25.75
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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: 4669581 pcs
thumb image of 13.1ct Drilled Sphere Blue Lapis Lazuli (ID: 466958)
13.12 ct Lapis Lazuli
12.1 mm
$ 13.12
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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: 4669422 pcs
thumb image of 25.9ct Drilled Sphere Blue Lapis Lazuli (ID: 466942)
25.87 ct Lapis Lazuli
12.1 mm
$ 25.87
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ID: 4669381 pcs
thumb image of 13ct Drilled Sphere Blue Lapis Lazuli (ID: 466938)
13.04 ct Lapis Lazuli
12 mm
$ 13.04
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ID: 4669432 pcs
thumb image of 26.2ct Drilled Sphere Blue Lapis Lazuli (ID: 466943)
26.15 ct Lapis Lazuli
11.9 mm
$ 26.15
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ID: 4669571 pcs
thumb image of 13ct Drilled Sphere Blue Lapis Lazuli (ID: 466957)
13.04 ct Lapis Lazuli
12 mm
$ 13.04
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ID: 3990651 pcs
thumb image of 5.2ct Round Petal Cut White Quartz (ID: 399065)
5.22 ct Quartz
11.7 mm
$ 8.30
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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: 4669612 pcs
thumb image of 26.6ct Drilled Sphere Blue Lapis Lazuli (ID: 466961)
26.61 ct Lapis Lazuli
12.1 mm
$ 26.61
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ID: 4706002 pcs
thumb image of 15ct Round Cabochon Green Jadeite (ID: 470600)
15.00 ct Jadeite
12.3 mm
$ 45.00
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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