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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Overall Rating -> 10

I really enjoy browsing through GemSelect. The selection is always marvelous and I love how detailed everything is described. The only thing I noticed is that when browsing through my phone, the videos of the gems do not load. If there were more videos of the gems, that would be amazing, though I understand that is a lot of work on GemSelect's part! Checking out is also very fast and easy, and I love that the return policy is very good, though I hope I don't have to use it anytime soon.

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Overall Rating -> 10

Website was incredibly easy and fast to use. Navigation and product outlay was simple and enjoyable to browse. Thank you and have a blessed day!

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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

Posted By Jf in January, 2024

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Overall Rating -> 10

I have used this site for sseveral years now. All has been great. I started collection gems from GemSelect for years and wanted to collect at least one of most stones. I loved Safers because the mols is a 9 + and they come in every color. This is the best place to buy gems for the assortment and price. Great place to learn about gems too. Sometimes the shipping is a little on the long side. But I would give them a 9.9 out of 10 !!

Posted By Steve in July, 2023

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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

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 -> 10

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

Posted By Kate in December, 2023

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Overall Rating -> 10

Selection and purchasing online was very easy

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Overall Rating -> 10

Great site

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Overall Rating -> 10

I love GemSelect, photos and details are great.

Posted By #1 in February, 2024

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Overall Rating -> 10

Super easy to do business for great products.

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Overall Rating -> 10

Great selection and excellent website.

Posted By JBW in October, 2023

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Overall Rating -> 9

I have been buy from you for years

Posted By JohnA in May, 2023

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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

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Overall Rating -> 10

Everything was fine.

Posted By Matt in March, 2024

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Gemstones A-Z

Buy Round Shape 8 mm Gems

1.43 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.5 x 6.1 mm

1.67 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.2 x 7.1 mm

0.75 ct Cushion Cut Color-Change Diaspore, 5.7 x 4.6 mm From Turkey

0.57 ct Green Sphene, 5.8 x 4.5 mm Oval Cut From Sri Lanka

2.97 ct Orange Sunstone, 7.2 x 5.2 mm Oval Cut From India

1.52 ct Blue Star Sapphire, 7.1 x 5.2 mm Oval Cut From Thailand

2.3 carat Pink Tourmaline, Round Cabochon loose Tourmaline from Mozambique, Natural Untreated Gems, 6.3 mm

7.53 carat Bi-color Ametrine, Emerald-Cut loose Ametrine from Brazil, Natural Untreated Gem, 12.4 x 11.9 mm

0.52 carat Round Opal, loose Certified Opal from Ethiopia, Natural Gem, 6.1 mm

2.85 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 19.1 x 4.2 mm

1.6 carat Yellow Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gems, 8.1 x 6 mm

1.8 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 5.8 x 4.1 mm

14.53 ct Yellow Quartz, 12.2 x 12.1 mm Carved From Brazil

22.58 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 28.4 x 18.5 mm

2.8 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10 x 5.1 mm

3.7 carat White Zircon, Diamond-Cut loose Zircon from Colombia, Natural Gems, 6.9 mm

2.48 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.1 x 4.1 mm

5.43 ct Loose Round Cut Sapphire, 2.6 mm From Tanzania

13.51 carat Marquise Cut Ammolite, loose Certified Ammolite from Canada, Natural Gem, 22.4 x 14.8 mm

2.28 ct Orange Moonstone, 7.1 x 7 mm Square Cut From India

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

1.75 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gems, 8.2 x 6.2 mm

1.29 ct Blue Kyanite, 7.1 x 5.2 mm Oval Cut From Nepal

3.66 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.1 x 4.2 mm

17.89 ct Loose Oval Lapis Lazuli, 16.5 x 12.9 mm From Afghanistan

2.83 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 9.9 x 8 mm

0.45 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gem, 5.9 x 3.9 mm

6.05 ct Round Rutile Quartz, 11.1 mm From India

1.08 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6.1 x 4 mm

2.26 ct Round Cut Andalusite, 4.1 mm From Brazil

1.91 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.3 x 7.2 mm

2.98 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 24.2 x 3.9 mm

Gemstone Information

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