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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (377): Round Shape 12 mm Gems Clear All
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ID: 3469381 pcs
thumb image of 5.7ct Round Facet Yellow Golden Citrine (ID: 346938)
5.72 ct Citrine
12 mm
$ 42.79
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ID: 4086161 pcs
thumb image of 5.4ct Diamond-Cut White Quartz (ID: 408616)
5.42 ct Quartz
11.8 mm
$ 8.40
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ID: 4176892 pcs
thumb image of 10.4ct Round Checkerboard (double sided) Lemon Quartz (ID: 417689)
10.43 ct Quartz
11.9 mm
$ 20.86
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ID: 4489991 pcs
thumb image of 6.2ct Round Cabochon Golden Red Rutile Quartz (ID: 448999)
6.24 ct Rutile Quartz
12.2 mm
$ 15.60
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ID: 3696121 pcs
thumb image of 7.4ct Round Cabochon White Quartz Cat's Eye (ID: 369612)
7.43 ct Quartz Cat's Eye
12.2 mm
$ 24.07
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ID: 4178551 pcs
thumb image of 5.4ct Round Checkerboard (double sided) Lemon Quartz (ID: 417855)
5.42 ct Quartz
12 mm
$ 10.84
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ID: 3606211 pcs
thumb image of 8.1ct Round Cabochon White Quartz Cat's Eye (ID: 360621)
8.13 ct Quartz Cat's Eye
12 mm
$ 32.52
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ID: 4166771 pcs
thumb image of 4.8ct Round Checkerboard (double sided) Brown Smoky Quartz (ID: 416677)
4.77 ct Smoky Quartz
12.1 mm
$ 7.15
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ID: 4388541 pcs
thumb image of 6.5ct Round Rose-Cut Black Spinel (ID: 438854)
6.49 ct Spinel
11.9 mm
$ 19.47
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ID: 2932281 pcs
thumb image of 6ct Round Cabochon Multicolor Ruby-Zoisite (ID: 293228)
5.97 ct Ruby-Zoisite
11.7 mm
$ 16.42
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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: 3694292 pcs
thumb image of 16.7ct Round Cabochon White Quartz Cat's Eye (ID: 369429)
16.66 ct Quartz Cat's Eye
12 mm
$ 53.98
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ID: 4176792 pcs
thumb image of 10.6ct Round Checkerboard (double sided) Lemon Quartz (ID: 417679)
10.56 ct Quartz
11.9 mm
$ 21.12
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ID: 3325391 pcs
thumb image of 5.2ct Round Facet Yellow Golden Citrine (ID: 332539)
5.16 ct Citrine
12 mm
$ 41.28
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ID: 3606341 pcs
thumb image of 7.8ct Round Cabochon White Quartz Cat's Eye (ID: 360634)
7.77 ct Quartz Cat's Eye
11.8 mm
$ 31.08
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ID: 3326011 pcs
thumb image of 6ct Round Facet Yellow Golden Citrine (ID: 332601)
5.95 ct Citrine
12 mm
$ 47.60
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ID: 4348942 pcs
thumb image of 25.5ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 434894)
25.49 ct Rutile Quartz
12.2 mm
$ 25.49
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ID: 4079631 pcs
thumb image of 5.8ct Diamond-Cut Brown Smoky Quartz (ID: 407963)
5.78 ct Smoky Quartz
11.9 mm
$ 10.35
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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: 4384892 pcs
thumb image of 14.7ct Round Rose-Cut Black Spinel (ID: 438489)
14.70 ct Spinel
12.1 mm
$ 44.10
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ID: 3381701 pcs
thumb image of 13.5ct Spherical Silver Pearl (ID: 338170)
13.50 ct Pearl
12.3 mm
$ 189.99
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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