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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (202): Round Shape 13 mm Gems Clear All
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ID: 3925192 pcs
thumb image of 15.8ct Round Cabochon Violet Amethyst (ID: 392519)
15.80 ct Amethyst
13 mm
$ 79.00
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ID: 4354891 pcs
thumb image of 7.1ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435489)
7.13 ct Rutile Quartz
13 mm
$ 17.68
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ID: 3350521 pcs
thumb image of 10.3ct Round Cabochon Multicolor Ruby-Zoisite (ID: 335052)
10.33 ct Ruby-Zoisite
13 mm
$ 20.66
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ID: 4359531 pcs
thumb image of 7.2ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435953)
7.17 ct Rutile Quartz
13.1 mm
$ 17.78
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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: 4354911 pcs
thumb image of 8ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435491)
7.95 ct Rutile Quartz
13.2 mm
$ 19.72
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ID: 3925851 pcs
thumb image of 9.8ct Round Cabochon Violet Amethyst (ID: 392585)
9.80 ct Amethyst
13.1 mm
$ 49.00
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ID: 4083711 pcs
thumb image of 7.3ct Diamond-Cut White Quartz (ID: 408371)
7.28 ct Quartz
12.9 mm
$ 11.28
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ID: 4035881 pcs
thumb image of 10.5ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403588)
10.45 ct Rutile Quartz
13.3 mm
$ 33.13
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ID: 4033841 pcs
thumb image of 10.5ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403384)
10.51 ct Rutile Quartz
13.2 mm
$ 33.32
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ID: 4080101 pcs
thumb image of 7.3ct Diamond-Cut Brown Smoky Quartz (ID: 408010)
7.34 ct Smoky Quartz
13.1 mm
$ 13.14
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ID: 4358161 pcs
thumb image of 8ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435816)
8.01 ct Rutile Quartz
13 mm
$ 19.86
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ID: 4087511 pcs
thumb image of 7.3ct Diamond-Cut White Quartz (ID: 408751)
7.29 ct Quartz
12.9 mm
$ 11.30
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ID: 4037162 pcs
thumb image of 16.4ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403716)
16.35 ct Rutile Quartz
13.2 mm
$ 51.83
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ID: 4188511 pcs
thumb image of 7.2ct Round Cabochon Cream Peach Star Moonstone (ID: 418851)
7.16 ct Star Moonstone
12.9 mm
$ 28.64
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ID: 4081021 pcs
thumb image of 7.6ct Diamond-Cut Brown Smoky Quartz (ID: 408102)
7.57 ct Smoky Quartz
13.1 mm
$ 13.55
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ID: 3955371 pcs
thumb image of 6.4ct Round Cabochon Golden Brown Rutile Quartz (ID: 395537)
6.37 ct Rutile Quartz
12.8 mm
$ 20.26
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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: 4353541 pcs
thumb image of 9ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435354)
9.04 ct Rutile Quartz
13 mm
$ 22.42
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ID: 3925861 pcs
thumb image of 8.7ct Round Cabochon Violet Amethyst (ID: 392586)
8.74 ct Amethyst
13 mm
$ 43.70
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ID: 4234512 pcs
thumb image of 34ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 423451)
33.97 ct Rutile Quartz
13.2 mm
$ 33.97
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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