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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (348): 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: 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: 4384362 pcs
thumb image of 14.2ct Round Rose-Cut Black Spinel (ID: 438436)
14.18 ct Spinel
12 mm
$ 42.54
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ID: 4187271 pcs
thumb image of 6.8ct Round Cabochon Cream Star Moonstone (ID: 418727)
6.76 ct Star Moonstone
12.2 mm
$ 27.04
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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: 3618202 pcs
thumb image of 22.6ct Drilled Sphere Multicolor Jasper (ID: 361820)
22.63 ct Jasper
11.9 mm
$ 22.63
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ID: 2486721 pcs
thumb image of 5.6ct Round Facet Green Prehnite (ID: 248672)
5.61 ct Prehnite
12 mm
$ 25.24
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ID: 4178491 pcs
thumb image of 5.3ct Round Checkerboard (double sided) Lemon Quartz (ID: 417849)
5.31 ct Quartz
12 mm
$ 10.62
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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: 2438381 pcs
thumb image of 5.5ct Round Facet Green Prehnite (ID: 243838)
5.50 ct Prehnite
12 mm
$ 24.75
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ID: 4229622 pcs
thumb image of 26ct Drilled Sphere Gold Brown Tiger's Eye (ID: 422962)
26.02 ct Tiger's Eye
12.2 mm
$ 20.82
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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: 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: 3237702 pcs
thumb image of 13.2ct Round Cabochon Smoky Brown Smoky Quartz (ID: 323770)
13.17 ct Smoky Quartz
12.1 mm
$ 11.19
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ID: 2437902 pcs
thumb image of 11.8ct Round Facet Green Prehnite (ID: 243790)
11.75 ct Prehnite
12.1 mm
$ 52.88
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ID: 3382111 pcs
thumb image of 13.3ct Spherical Silver Pearl (ID: 338211)
13.34 ct Pearl
12.3 mm
$ 199.50
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ID: 3382871 pcs
thumb image of 13.3ct Spherical Silver Pearl (ID: 338287)
13.30 ct Pearl
12.3 mm
$ 199.50
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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: 3382091 pcs
thumb image of 13.5ct Spherical Silver Pearl (ID: 338209)
13.49 ct Pearl
12.3 mm
$ 198.99
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ID: 4143701 pcs
thumb image of 6.9ct Round Petal Cut Pink Rose Quartz (ID: 414370)
6.88 ct Rose Quartz
11.9 mm
$ 34.40
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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