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You Selected (303): Round Shape 13 mm Gems Clear All
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ID: 4354901 pcs
thumb image of 8ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435490)
7.98ct Rutile Quartz
13.03 x 6.31mm
USD 19.79
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ID: 4034741 pcs
thumb image of 8.3ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403474)
8.33ct Rutile Quartz
13.02 x 6.34mm
USD 26.41
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ID: 4012121 pcs
thumb image of 8.7ct Round Petal Cut Brown Smoky Quartz (ID: 401212)
8.65ct Smoky Quartz
12.88 x 10.35mm
USD 21.62
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ID: 4080111 pcs
thumb image of 6.3ct Diamond-Cut Brown Smoky Quartz (ID: 408011)
6.30ct Smoky Quartz
12.59 x 8.80mm
USD 11.28
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ID: 4069371 pcs
thumb image of 9.6ct Round Cabochon Green Maw-Sit-Sit (ID: 406937)
9.64ct Maw-Sit-Sit
13.07 x 6.95mm
USD 27.18
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ID: 3638592 pcs
thumb image of 15.8ct Round Cabochon Purple Amethyst (ID: 363859)
15.75ct Amethyst
12.92 x 6.48mm
USD 78.75
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ID: 4040681 pcs
thumb image of 6.3ct Round Cabochon Colorless Golden Rutile Quartz (ID: 404068)
6.33ct Rutile Quartz
12.78 x 5.17mm
USD 25.32
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ID: 4031081 pcs
thumb image of 6.8ct Round Cabochon Colorless Black Rutile Quartz (ID: 403108)
6.84ct Rutile Quartz
13.23 x 5.08mm
USD 20.52
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ID: 4034671 pcs
thumb image of 10.2ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403467)
10.19ct Rutile Quartz
12.92 x 7.83mm
USD 32.30
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ID: 4031031 pcs
thumb image of 6.6ct Round Cabochon Colorless Black Rutile Quartz (ID: 403103)
6.59ct Rutile Quartz
13.25 x 5.03mm
USD 19.77
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ID: 4354992 pcs
thumb image of 16.7ct Round Cabochon Colorless Golden Rutile Quartz (ID: 435499)
16.70ct Rutile Quartz
13.03 x 6.34mm
USD 41.42
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ID: 3382851 pcs
thumb image of 14ct Spherical Silver Pearl (ID: 338285)
13.97ct Pearl
12.53mm
USD 209.55
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ID: 4144401 pcs
thumb image of 8.3ct Round Petal Cut Pink Rose Quartz (ID: 414440)
8.32ct Rose Quartz
12.89 x 9.68mm
USD 41.60
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ID: 4037152 pcs
thumb image of 14.1ct Round Cabochon Colorless Golden Rutile Quartz (ID: 403715)
14.06ct Rutile Quartz
13.02 x 5.38mm
USD 44.57
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ID: 3335621 pcs
thumb image of 13.7ct Spherical Golden Pearl (ID: 333562)
13.73ct Pearl
12.52mm
USD 280.37
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ID: 4201911 pcs
thumb image of 8.8ct Round Facet Swiss Blue Topaz (ID: 420191)
8.75ct Topaz
13.04 x 7.32mm
USD 61.25
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ID: 4234492 pcs
thumb image of 35.3ct Drilled Sphere Colorless Golden Rutile Quartz (ID: 423449)
35.25ct Rutile Quartz
13.42mm
USD 28.20
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ID: 3758961 pcs
thumb image of 8.2ct Round Cabochon Violet Amethyst (ID: 375896)
8.15ct Amethyst
12.96 x 6.75mm
USD 40.75
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ID: 3925951 pcs
thumb image of 7.2ct Round Cabochon Violet Amethyst (ID: 392595)
7.16ct Amethyst
13.21 x 6.02mm
USD 35.80
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ID: 4083721 pcs
thumb image of 6.9ct Diamond-Cut White Quartz (ID: 408372)
6.86ct Quartz
12.91 x 9.06mm
USD 10.63
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ID: 4324801 pcs
thumb image of 8.7ct Round Petal Cut Brown Smoky Quartz (ID: 432480)
8.65ct Smoky Quartz
12.53 x 10.60mm
USD 14.70
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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