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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (214): Round Shape 13 mm Gems Clear All
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ID: 4080121 pcs
thumb image of 7.5ct Diamond-Cut Brown Smoky Quartz (ID: 408012)
7.47 ct Smoky Quartz
13 mm
$ 13.37
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ID: 2193741 pcs
thumb image of 11.3ct Round Facet Red Orange Sphalerite (ID: 219374)
11.33 ct Sphalerite
12.8 mm
$ 621.50
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ID: 4354951 pcs
thumb image of 9.6ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435495)
9.61 ct Rutile Quartz
13.2 mm
$ 23.83
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ID: 4033881 pcs
thumb image of 10.1ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403388)
10.11 ct Rutile Quartz
13.3 mm
$ 32.05
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ID: 4087471 pcs
thumb image of 6.9ct Diamond-Cut White Quartz (ID: 408747)
6.89 ct Quartz
12.8 mm
$ 10.68
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ID: 4013421 pcs
thumb image of 10.1ct Round Petal Cut Brown Smoky Quartz (ID: 401342)
10.14 ct Smoky Quartz
12.9 mm
$ 25.35
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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: 4358152 pcs
thumb image of 15.8ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435815)
15.82 ct Rutile Quartz
13 mm
$ 39.23
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ID: 3240781 pcs
thumb image of 7.6ct Round Cabochon Smoky Brown Smoky Quartz (ID: 324078)
7.64 ct Smoky Quartz
13.1 mm
$ 6.49
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ID: 3925172 pcs
thumb image of 20ct Round Cabochon Violet Amethyst (ID: 392517)
19.98 ct Amethyst
13.3 mm
$ 99.90
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ID: 3240761 pcs
thumb image of 9ct Round Cabochon Smoky Brown Smoky Quartz (ID: 324076)
9.03 ct Smoky Quartz
13.3 mm
$ 7.68
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ID: 3382881 pcs
thumb image of 13.1ct Spherical Silver Pearl (ID: 338288)
13.05 ct Pearl
13.1 mm
$ 195.75
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ID: 3925972 pcs
thumb image of 18.9ct Round Cabochon Violet Amethyst (ID: 392597)
18.92 ct Amethyst
12.9 mm
$ 94.60
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ID: 4354961 pcs
thumb image of 7.8ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435496)
7.79 ct Rutile Quartz
13 mm
$ 19.32
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ID: 4353461 pcs
thumb image of 8.9ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435346)
8.92 ct Rutile Quartz
13 mm
$ 22.12
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ID: 3925182 pcs
thumb image of 18.2ct Round Cabochon Violet Amethyst (ID: 392518)
18.24 ct Amethyst
13.2 mm
$ 91.20
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ID: 4031891 pcs
thumb image of 11.6ct Round Cabochon Cream Star Moonstone (ID: 403189)
11.58 ct Star Moonstone
13.3 mm
$ 40.88
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ID: 4189481 pcs
thumb image of 11.3ct Round Cabochon Cream Star Moonstone (ID: 418948)
11.34 ct Star Moonstone
13 mm
$ 45.36
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ID: 4628811 pcs
thumb image of 9.2ct Round Cabochon Gray Blue Sheen Labradorite (ID: 462881)
9.17 ct Labradorite
13.2 mm
$ 9.26
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ID: 3638642 pcs
thumb image of 16.9ct Round Cabochon Purple Amethyst (ID: 363864)
16.87 ct Amethyst
13.2 mm
$ 84.35
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ID: 4166591 pcs
thumb image of 9.7ct Round Cabochon Cream Star Moonstone (ID: 416659)
9.72 ct Star Moonstone
13.2 mm
$ 38.88
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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