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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (235): Round Shape 13 mm Gems Clear All
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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: 4348022 pcs
thumb image of 30.9ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 434802)
30.85 ct Rutile Quartz
12.9 mm
$ 30.85
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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: 3382201 pcs
thumb image of 15.5ct Spherical Silver Pearl (ID: 338220)
15.48 ct Pearl
12.9 mm
$ 232.20
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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: 4595701 pcs
thumb image of 7.6ct Round Facet Violet Amethyst (ID: 459570)
7.64 ct Amethyst
12.9 mm
$ 45.84
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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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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: 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: 3241102 pcs
thumb image of 16.3ct Round Cabochon Smoky Brown Smoky Quartz (ID: 324110)
16.27 ct Smoky Quartz
13.1 mm
$ 13.83
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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: 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: 4358491 pcs
thumb image of 6ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435849)
5.98 ct Rutile Quartz
12.9 mm
$ 14.83
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ID: 4323501 pcs
thumb image of 9.5ct Round Petal Cut Brown Smoky Quartz (ID: 432350)
9.51 ct Smoky Quartz
13 mm
$ 16.17
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ID: 4208931 pcs
thumb image of 7.5ct Round Cabochon Cream Star Moonstone (ID: 420893)
7.52 ct Star Moonstone
13.3 mm
$ 22.56
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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: 4596231 pcs
thumb image of 5.6ct Round Facet Violet Amethyst (ID: 459623)
5.57 ct Amethyst
12.7 mm
$ 33.42
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ID: 4037152 pcs
thumb image of 14.1ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403715)
14.06 ct Rutile Quartz
13 mm
$ 44.57
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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: 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: 3926202 pcs
thumb image of 16.8ct Round Cabochon Violet Amethyst (ID: 392620)
16.84 ct Amethyst
12.9 mm
$ 84.20
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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