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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (376): Round Shape 13 mm Gems Clear All
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16.1ct Drilled Sphere Multicolor Jasper Gem (ID: 469882)
16.09 ct (total 48.28ctw) Jasper
12.6 mm
$ 25.11
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1 pc
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9.6ct Round Facet Pinkish Rose Malaya Garnet Gem (ID: 498583)
9.59 ct Malaya Garnet
12.5 mm
$ 383.60
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1 pc
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7.4ct Diamond-Cut White Quartz Gem (ID: 408745)
7.37 ct Quartz
12.9 mm
$ 11.42
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1 pc
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8.6ct Round Cabochon Colorless Golden Rutile Quartz Gem (ID: 435859)
8.61 ct Rutile Quartz
13 mm
$ 21.35
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1 pc
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15ct Spherical Silver Pearl Gem (ID: 338168)
15.01 ct Pearl
12.6 mm
$ 219.50
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10.4ct Round Cabochon White Quartz Cat's Eye Gem (ID: 351439)
10.40 ct Quartz Cat's Eye
12.8 mm
$ 41.60
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9.8ct Round Cabochon Cream Cat's Eye Moonstone Gem (ID: 481763)
9.75 ct Cat's Eye Moonstone
13.3 mm
$ 39.00
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10.5ct Round Cabochon Cream Cat's Eye Moonstone Gem (ID: 481512)
10.47 ct Cat's Eye Moonstone
13.2 mm
$ 51.30
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11.3ct Round Facet Red Orange Sphalerite Gem (ID: 219374)
11.33 ct Sphalerite
12.8 mm
$ 621.50
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2 pcs
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9.5ct Round Cabochon Green Jadeite Gem (ID: 481246)
9.53 ct (total 19.05ctw) Jadeite
12.9 mm
$ 38.10
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10.2ct Round Cabochon White Quartz Cat's Eye Gem (ID: 351441)
10.22 ct Quartz Cat's Eye
12.9 mm
$ 40.88
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10.1ct Round Cabochon White Quartz Cat's Eye Gem (ID: 351445)
10.14 ct Quartz Cat's Eye
12.8 mm
$ 40.56
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7.6ct Round Facet Brown Smoky Quartz Gem (ID: 465774)
7.60 ct Smoky Quartz
13 mm
$ 11.40
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8.7ct Round Cabochon Green Maw-Sit-Sit Gem (ID: 477817)
8.69 ct Maw-Sit-Sit
12.5 mm
$ 18.51
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Click for Product Video (413958)
14.6ct Round Cabochon Greenish Golden Cat's Eye Apatite Gem (ID: 413958)
14.61 ct Cat's Eye Apatite
13.3 mm
$ 146.10
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9.9ct Round Cabochon White Quartz Cat's Eye Gem (ID: 351462)
9.91 ct Quartz Cat's Eye
13.2 mm
$ 39.64
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9.9ct Round Cabochon White Quartz Cat's Eye Gem (ID: 351466)
9.90 ct Quartz Cat's Eye
13 mm
$ 39.60
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1 pc
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7.4ct Round Petal Cut Lemon Quartz Gem (ID: 401437)
7.41 ct Quartz
12.5 mm
$ 37.05
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2 pcs
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Click for Product Video (392597)
9.5ct Round Cabochon Violet Amethyst Gem (ID: 392597)
9.46 ct (total 18.92ctw) Amethyst
12.9 mm
$ 94.60
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11.3ct Round Cabochon Cream Star Moonstone Gem (ID: 418948)
11.34 ct Star Moonstone
13 mm
$ 45.36
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7.5ct Round Facet Brown Smoky Quartz Gem (ID: 466279)
7.46 ct Smoky Quartz
13.4 mm
$ 11.19
Item in Stock
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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.

Certified Customer Reviews
Overall Rating -> 10 star ratings
This was my second purchase from GemSelect and definitely won’t be my last! They have a very wide variety of gems and you can always find what you are looking for with ease and the prices are very good.
Posted By Jill in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Loved the wide selection of product
Posted By Miki in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
finally bought the last rock to complete my ring idea; needed another white one after giving the big diamond to my daughter. a diamond that size is out of my retired-school-teacher budget, so i bought a white zircon. went back to the same place that i got my loose sapphire-- great selection, good prices, good delivery!
Posted By Ptcmom in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I'm always real pleased with this website, I don't think there is much you could do to make it any better. I wish the shipping charges were lower, but it is understandable.
Posted By Spinch13 in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
This is a site that sources valuable and genuine stones forms around the world, with and honest and descriptive sections, as well as specs, and the option to have the gemstone collection one might purchased—certified! Price ranges vary, but are always affordable and always worth it, whether it’s a gift, or for a personal business.
Posted By Bradley in November, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I am bored and shopping , it was fun
Posted By Nanorex in November, 2018
Source: Bizrate
Popular Gemstones
All Gemstones (144)
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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