Calibrated 8 mm Round Shape Loose Natural 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 8 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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Gemstone Information

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Overall Rating -> 10

first time here sooooooooooo we will seeeee!!!!! so far so good!!!!!!

Posted By Seastone 56 in October, 2023

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Overall Rating -> 10

Easy to navigate

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Overall Rating -> 10

It was easy to search and find what i wanted

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Overall Rating -> 10

Excellent experience!

Posted By Steph in April, 2023

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Overall Rating -> 10

I found it to be easy to browse and easy to use

Posted By Kyle in December, 2023

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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

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Overall Rating -> 10

My only complaint is that there are so many beautiful and affordable stones that I get distracted from what I planned to order.

Posted By Phoenix in March, 2024

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Overall Rating -> 8

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

Posted By MI photo in May, 2023

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Overall Rating -> 10

The website design is a bit finicky for mobile, but Im sure its most likely just a mobile issue. Amazing selection of products, great prices.

Posted By Kuba in December, 2023

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Overall Rating -> 10

GemSelect has the Best gems. Clear photos and detailed description helps me make the best choice. I have Never been disappointed by thier quality items.

Posted By Rock Hound in July, 2023

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Overall Rating -> 10

The website is well organized and works fast forward and back. Plenty of filters. Each gem is described in detail and you receive the one pictured. Gem material info and sources available. I would like to see more specifics on sources besides country- at least region or state and in the US with Turquiose which mine. Thanks!

Posted By Orchidisle in February, 2024

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Overall Rating -> 9

GemSelect has a fantastic assortment of Semi-precious stones. I have not found any other web site with the variety you have.

Posted By RobDill in August, 2023

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Overall Rating -> 10

Convenient selection, arrival on time

Posted By Alin in February, 2024

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Overall Rating -> 9

It went well

Posted By Rob in December, 2023

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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

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Gemstones A-Z

Buy Round Shape 8 mm Gems

3.83 ct Loose Trillion Cut Mystic Quartz, 8.1 x 8.1 mm From Brazil

3.74 ct Round Checkerboard Smoky Quartz, 8.1 mm From Brazil

0.51 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 6.1 x 4.1 mm

2.13 carat Orange Hessonite Garnet, Baguette Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.7 x 5.6 mm

1.4 ct Oval Sillimanite Cat's Eye, 7.7 x 5 mm From Madagascar

20.61 carat Pear Moss Agate, loose Certified Moss Agate from India, Natural Untreated Gems, 29.7 x 12.7 mm

1.36 ct Pink Morganite, 8.4 x 6.2 mm Oval Cut From Afghanistan

2 ct Blue Green Grandidierite, 7.8 mm Round Cut From Madagascar

8.02 ct Yellow Quartz, 10 x 10 mm Odd Shaped From Brazil

1.63 ct Purple Spinel, 7.5 x 5.9 mm Oval Cut From Tanzania

0.99 carat Orange Sunstone, Oval loose Sunstone from India, Natural Untreated Gem, 8 x 6.2 mm

20.68 ct Odd Shaped Jasper, 27.5 x 14.9 mm From Indonesia

0.7 ct Loose Pink Sapphire, 6.1 x 5.1 mm Oval Cut From Madagascar

2.34 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 5.9 x 3 mm

8.16 ct Asscher Cut Rose Quartz, 12.1 x 12.1 mm From South Africa

0.2 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.3 mm

7.74 carat Round Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 7.8 mm

1.27 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gems, 7.1 x 5.1 mm

4.44 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9.9 x 7.9 mm

1.07 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gems, 4.9 mm

5.3 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.1 x 9.9 mm

2.97 carat Blue Green Fluorite, Pear Shape loose Fluorite from India, Natural Untreated Gem, 10.5 x 7.6 mm

49.22 ct Fancy Tiger's Eye Matrix, 30.5 x 20.6 mm From India

0.8 ct Octagon Cut Color-Change Diaspore, 7.1 x 4.2 mm From Turkey

40.98 ct Cushion Charoite, 30.8 x 23.7 mm From Russia

20.1 carat Blue Aquamarine, Oval loose Aquamarine from Madagascar, Natural Untreated Gem, 21.6 x 16.5 mm

1.47 carat Pink Malaya Garnet, Marquise Cut loose Malaya Garnet from Tanzania, Natural Untreated Gem, 10.6 x 5.3 mm

0.84 carat Blue Kyanite, Pear Shape loose Kyanite from Nepal, Natural Untreated Gem, 7.1 x 5 mm

12.03 ct Loose Oval Bloodstone, 16.1 x 12.8 mm From Madagascar

1.09 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 11.1 x 6 mm

3.09 ct Square Cut Rainbow Moonstone, 3.1 x 3 mm From Sri Lanka

3.47 ct Round Cut Strawberry Quartz, 9.9 mm From Russia

Gemstone Information

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