Buy 13 mm Round Calibrated Gemstones from GemSelect

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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Posted By Dorita in March, 2024

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Overall Rating -> 10

The website is user friendly, has excellent selection. I've always found what I was looking for with Gem Select. When others don't have it they do. And most important, they have a way for you to pay without using PayPal. I cannot use PayPal they closed my account because of no cell phone.

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Overall Rating -> 10

i love this site, the gems are always of good quality, i've been buy gifts from the site for 10 years, love it

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Overall Rating -> 8

purchased birthstones to be mounted into stud earrings as a gift for a friend's gift

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Overall Rating -> 10

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Overall Rating -> 9

My first purchase went well. I will purchase more gems in the future.

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Overall Rating -> 10

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Overall Rating -> 10

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Overall Rating -> 10

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Overall Rating -> 10

The gems were as described, which is kind of rare these days. I am happy with the purchase, and delevery on time.

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Overall Rating -> 10

I have used GemSelect for several years and plan to shop more in the further. This is a good source of information on gemstones. I love looking at and learning about them. Lot more than I ever knew existed.

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Overall Rating -> 10

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Overall Rating -> 10

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Gemstones A-Z

Buy Round Shape 13 mm Gems

2.39 ct Yellow Quartz, 9.5 x 9.1 mm Carved From Brazil

0.86 ct Loose Round Cut Lapis Lazuli, 6.1 mm From Afghanistan

41.24 ct Oval Jasper, 29.1 x 22.2 mm From Indonesia

7.14 ct Octagon Concave Cut Smoky Quartz, 12 x 12 mm From Brazil

1.4 ct Blue Green Grandidierite, 8.1 x 6.6 mm Oval Cut From Madagascar

0.43 carat Blue Sapphire, Trillion-Cut loose Sapphire from Madagascar, Natural Gem, 4.3 x 4.3 mm

1.45 ct Square Tiger's Eye, 5.9 x 5.9 mm From Thailand

48.91 ct Oval Jasper, 42.6 x 26 mm From Indonesia

1.31 carat Green Fluorite, Oval loose Fluorite from India, Natural Untreated Gem, 7.7 x 6.2 mm

4.5 ct Rainbow Pyrite, 11.5 x 11.4 mm From Russia

0.99 ct Loose Purple Tourmaline, 6.3 mm Round Cabochon From Mozambique

13.4 ct Oval Maw-Sit-Sit, 15.6 x 12.5 mm From Myanmar

1.85 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 19.4 x 3.5 mm

3.96 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.1 mm

14.22 ct Octagon Concave Cut Smoky Quartz, 16.2 x 16 mm From Brazil

9.4 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 19.2 x 8.3 mm

1.45 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 4.9 mm

2.4 ct Oval Cat's Eye Opal, 8.9 x 6.9 mm From Madagascar

5.47 ct Yellow Quartz, 12.1 mm Round Concave Cut From Brazil

0.74 carat Blue Tanzanite, Round loose Tanzanite from Tanzania, Natural Gem, 5.1 mm

3.33 carat Heart Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9.8 x 9.9 mm

3.63 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 11.6 x 6.4 mm

0.53 ct Loose Yellow Sapphire, 4.8 x 3.9 mm Octagon Cut From Tanzania

11.42 ct Fancy Boulder Opal, 21.7 x 18.6 mm From Australia

4.56 ct Cushion Onyx, 11 x 10.9 mm From Sri Lanka

1.54 ct Loose Oval Cut Black Opal, 10.2 x 8 mm From Ethiopia

3.28 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.8 x 5 mm

3.63 ct Round Checkerboard Smoky Quartz, 8 mm From Brazil

25.7 carat Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 22.5 x 15.5 mm

1.52 ct Oval Cut Golden Beryl, 9 x 6.8 mm From Madagascar

9.01 ct Odd Shaped Druzy Variscite, 21.7 x 15.5 mm From China

0.75 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gems, 5.1 x 3.8 mm

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