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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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

Source: Bizrate

Overall Rating -> 10

Excellent experience!

Posted By Steph in April, 2023

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Overall Rating -> 10

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023

Source: Bizrate

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

Posted By Jf in January, 2024

Source: Bizrate

Overall Rating -> 10

Easy to use as always and in all steps from opening site to paying.

Posted By Pete in February, 2024

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Overall Rating -> 10

It was easy to find the color gem I desired and checkout was simple as well. Very excited to receive my gemstone.

Posted By Nikki J in September, 2023

Source: Bizrate

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

Posted By Jf in January, 2024

Source: Bizrate

Overall Rating -> 10

Fine. All emails answered. Excellent service. Nice discount added for orders. Briefly, a very good experience.

Posted By C.J. in February, 2024

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Overall Rating -> 8

I am currently pleased. I like the layout of the website.

Posted By RayPoppa in January, 2024

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Overall Rating -> 10

Very excited and impressed with all your products. Keep up the good work....more different stones to choose from. I like Cabachons.

Posted By Meow in June, 2023

Source: Bizrate

Overall Rating -> 10

It was easy to navigate and I hope that the gem is as nice as the picture

Posted By 1 in April, 2024

Source: Bizrate

Overall Rating -> 10

Was easy to search for many gems and mineral stones.Authenticity of natural stones is important, and I feel this site offers some assurance on this.

Posted By DanM in November, 2023

Source: Bizrate

Overall Rating -> 10

I enjoyed browsing though different varieties of rubies. I felt that the experience was simple and easy to navigate!

Posted By Daws in July, 2023

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Overall Rating -> 9

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

Posted By NoHalalAl in March, 2024

Source: Bizrate

Overall Rating -> 9

Everything was good but since I am still new I was surprised at how small the stones where.

Posted By Js in May, 2023

Source: Bizrate

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Gemstones A-Z

Buy Round Shape 13 mm Gems

8.12 ct Oval Agate, 12.6 x 12.3 mm From Indonesia

4.76 ct Fancy Fire Agate, 10.7 x 9.8 mm From Mexico

2.98 ct Cushion Checkerboard Peridot, 9.9 x 7.8 mm From China

2.69 carat Swiss Blue Topaz, Fancy-Cut loose Topaz from Brazil, Natural Gems, 10 x 4.9 mm

2.83 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 8.9 x 6.3 mm

0.32 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 4 mm

3.58 carat Pear Shape Opal, loose Certified Opal from Australia, Natural Untreated Gem, 14.5 x 10.4 mm

1.97 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.2 mm

2.5 carat Blue Sapphire, Briolette with Hole loose Sapphire from Madagascar, Natural Gems, 5.3 mm

2.39 ct Red Coral, 12.3 x 5.6 mm Oval Cut From Australia

33.55 ct Oval Cut Rose Quartz, 22.3 x 18.9 mm From South Africa

2.39 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.1 mm

12.56 carat Carved Fish Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 20.2 x 14.1 mm

0.45 ct Loose Yellow Sapphire, 5.1 x 4.2 mm Oval Cut From Tanzania

2.01 ct Orange Sunstone, 9.3 x 7.5 mm Oval Cut From India

6.34 carat Pear Rutile Quartz, loose Certified Rutile Quartz from India, Natural Untreated Gem, 15.1 x 10.8 mm

2.19 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5.2 x 3.1 mm

6.74 ct Green Agate, 12.7 x 11.3 mm Oval Cut From India

1.15 carat Green Sapphire, Round loose Sapphire from Tanzania, Natural Gems, 4.1 mm

4.3 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 12.2 mm

1.81 ct Loose Pear Labradorite, 9.2 x 6.1 mm From Madagascar

2.42 ct Odd Shaped Druzy Variscite, 16.8 x 12.3 mm From China

77.86 ct Cushion Jasper, 37.5 x 26 mm From Indonesia

30.03 ct Blue Sodalite, 40.9 x 9.6 mm Pencil Cut From Australia

19.51 ct Loose Pear Dendritic Agate, 18.4 x 13.1 mm From India

9.6 ct Oval Quartz With Marcasite, 15.7 x 12.2 mm From Brazil

11.47 ct Oval Serpentine, 21.5 x 13.7 mm From the United States

0.6 carat Yellow Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6.2 x 5.1 mm

5.46 carat Sky Blue Topaz, Half Drilled Briolette loose Topaz from Brazil, Natural Gems, 8 mm

0.4 ct Purple Spinel, 4.6 x 3.9 mm Octagon Cut From Tanzania

0.72 ct Loose Purple Sapphire, 8.5 x 5.3 mm Odd Shaped From Tanzania

3.8 ct Oval Concave Cut Smoky Quartz, 12 x 10.1 mm From Brazil

Gemstone Information

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