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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I purchase all of my stones from GemSelect! They're the best I've found for both selection and value.

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Overall Rating -> 10

Great website and information

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Very pleased with shopping on this site. It's easy to navigate and information about gemstones is very good.

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Easy and fast

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Overall Rating -> 10

was just windowshopping and spotted a couple "Very Uncommons", a tsavorite & a demantoid garnet that were both in a size I was looking for, & that I could very easily pay for -- so figured I would grab the tsavo ASAP and got the demantoid to accompany so they wouldn't be lonely.

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Super easy to do business for great products.

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Overall Rating -> 10

I love your selection of gems. My only complaing is I wish I could put in a page number to return to that page.When there are over 60 pages of gems it is hard to return to a page with a gem I am considering.

Posted By Cahall in March, 2024

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Overall Rating -> 10

blessed be the lord blessed be the saved blessed be the work blessed be the traveled i write down my good times in these stones and when times are gray i can still se the sunny days refract in these stones

Posted By Kickbass.2 in May, 2023

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Overall Rating -> 9

Easy to use. Limited supply of higher quality gemstones.

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Overall Rating -> 10

I FOUND WHAT I WANT IT

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Overall Rating -> 10

Great selection of various gems, easy to navigate site

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Overall Rating -> 10

LOVE YOU GUYS. YOU CARRY EVERY GEMSTON I WANT. THE PRICE IS GREAT,THE PRODUCT IS OUTSTANDING,AND THE SERVICE CANT BE BEET.

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Love Gem select. great gems for the price. Can't beet them

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Overall Rating -> 10

The site was easy to shop and the payment was secure. I’m looking forward to receiving my order!

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Gemstones A-Z

Buy Round Shape 13 mm Gems

0.97 ct Cushion Cut Color-Change Diaspore, 7.7 x 4.7 mm From Turkey

3.33 ct Green Sphene, 8.8 x 8 mm Oval Cut From Sri Lanka

0.82 ct Square Cut Color-Change Diaspore, 5.2 x 4.9 mm From Turkey

0.72 carat Red Malaya Garnet, Cushion loose Malaya Garnet from Tanzania, Natural Untreated Gem, 6.1 x 4.2 mm

4.45 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12 x 9.9 mm

1.96 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 5.6 mm

3.43 carat Yellow Citrine, Heart Checkerboard loose Citrine from Brazil, Natural Untreated Gems, 8.1 x 8.1 mm

6.62 ct Baguette Tiger's Eye, 14.2 x 10.2 mm From Thailand

0.67 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gem, 6.1 x 4.2 mm

3.02 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 4.9 x 4.8 mm

2.54 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gems, 6.9 x 5.1 mm

1.01 carat Yellow Citrine, Cushion loose Citrine from Brazil, Natural Untreated Gems, 5.1 x 5.1 mm

1.86 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.1 x 7 mm

1.01 carat Marquise Cut Ruby, loose Certified Ruby from Myanmar, Natural Gem, 9.3 x 4.3 mm

5.03 ct Round Pietersite, 10.4 mm From Namibia

1.26 ct Oval Sillimanite Cat's Eye, 7.2 x 5.4 mm From Madagascar

2.11 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 8.1 x 6.1 mm

5.33 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 9.9 x 7.9 mm

0.59 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from the United States, Natural Untreated Gem, 5.2 x 5 mm

2.77 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 x 10 mm

5.49 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 13.4 mm

0.94 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 9.9 x 6.4 mm

35.88 carat Oval Tiger's Eye, loose Certified Tiger's Eye from Thailand, Natural Untreated Gem, 36.7 x 19 mm

70.45 ct Fancy Charoite, 44.7 x 33.2 mm From Russia

5.27 carat White Topaz, Princess-Cut loose Topaz from Brazil, Natural Untreated Gems, 3.6 x 3.6 mm

4.71 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 14.2 x 8.1 mm

0.87 carat Purple Spinel, Pear Shape loose Spinel from Tanzania, Natural Untreated Gem, 7.9 x 4.8 mm

14.8 ct Oval Cut Rose Quartz, 15.7 x 14.8 mm From South Africa

1.57 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8.3 x 8.1 mm

1.12 ct Yellow Morganite, 8.2 x 6 mm Oval Cut From Afghanistan

23.36 carat Pear Dendritic Agate, loose Certified Dendritic Agate from India, Natural Untreated Gem, 24.2 x 16.5 mm

0.41 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 6.1 x 4.2 mm

Gemstone Information

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