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You Selected (204): Round Shape 13 mm Gems Clear All
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ID: 4039651 pcs
thumb image of 8.4ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403965)
8.37 ct Rutile Quartz
13.2 mm
$ 33.48
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ID: 4453681 pcs
thumb image of 7.1ct Round Facet Yellow Golden Citrine (ID: 445368)
7.08 ct Citrine
12.9 mm
$ 35.40
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ID: 4038481 pcs
thumb image of 7.9ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403848)
7.88 ct Rutile Quartz
12.8 mm
$ 31.52
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ID: 3697231 pcs
thumb image of 8.7ct Round Cabochon White Quartz Cat's Eye (ID: 369723)
8.70 ct Quartz Cat's Eye
12.9 mm
$ 28.19
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ID: 4069331 pcs
thumb image of 8ct Round Cabochon Green Maw-Sit-Sit (ID: 406933)
8.01 ct Maw-Sit-Sit
13.2 mm
$ 22.59
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ID: 4034741 pcs
thumb image of 8.3ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403474)
8.33 ct Rutile Quartz
13 mm
$ 26.41
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ID: 4358501 pcs
thumb image of 7.5ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435850)
7.54 ct Rutile Quartz
13 mm
$ 18.70
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ID: 4181301 pcs
thumb image of 8.3ct Round Cabochon Cream Star Moonstone (ID: 418130)
8.26 ct Star Moonstone
13.3 mm
$ 33.04
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ID: 4031572 pcs
thumb image of 14ct Round Cabochon Colorless Black Rutile Quartz (ID: 403157)
14.00 ct Rutile Quartz
13.2 mm
$ 42.00
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ID: 4031611 pcs
thumb image of 5.9ct Round Cabochon Colorless Black Rutile Quartz (ID: 403161)
5.88 ct Rutile Quartz
13.1 mm
$ 17.64
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ID: 4178591 pcs
thumb image of 8.9ct Diamond-Cut White Quartz (ID: 417859)
8.90 ct Quartz
13.2 mm
$ 14.24
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ID: 4034771 pcs
thumb image of 9.1ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403477)
9.11 ct Rutile Quartz
13.3 mm
$ 28.88
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ID: 4038511 pcs
thumb image of 7.5ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403851)
7.50 ct Rutile Quartz
12.9 mm
$ 30.00
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ID: 3925951 pcs
thumb image of 7.2ct Round Cabochon Violet Amethyst (ID: 392595)
7.16 ct Amethyst
13.2 mm
$ 35.80
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ID: 4038561 pcs
thumb image of 6.2ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403856)
6.24 ct Rutile Quartz
12.9 mm
$ 24.96
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ID: 3514631 pcs
thumb image of 9.5ct Round Cabochon White Quartz Cat's Eye (ID: 351463)
9.45 ct Quartz Cat's Eye
13.1 mm
$ 37.80
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ID: 4353491 pcs
thumb image of 8.6ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435349)
8.63 ct Rutile Quartz
13 mm
$ 21.40
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ID: 4069391 pcs
thumb image of 9.3ct Round Cabochon Green Maw-Sit-Sit (ID: 406939)
9.28 ct Maw-Sit-Sit
13 mm
$ 26.17
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ID: 4035871 pcs
thumb image of 7ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403587)
7.04 ct Rutile Quartz
13.1 mm
$ 22.32
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ID: 4030851 pcs
thumb image of 8.5ct Round Cabochon Colorless Black Rutile Quartz (ID: 403085)
8.53 ct Rutile Quartz
13.2 mm
$ 25.59
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ID: 4038521 pcs
thumb image of 8.5ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403852)
8.48 ct Rutile Quartz
12.9 mm
$ 33.92
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Round Shape 13 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 13 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