Buy 6.5 mm Round Calibrated Gemstones from GemSelect

Some people buy 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 6.5 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 even slightly higher. 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 -> 7

I placed order#384714 based on the picture on your website and the stone came in much darker. I'm sure it's the same stone i ordered but your lighting made it seem a lighter blue. I was trying to match a stone for a customer and based on the picture it would have been close enough but the stone in person is a mile off.

Posted By Bobk in February, 2024

Source: Bizrate

Overall Rating -> 10

This is only the second time I have ordered from GemSelect. I am a prolific gemstone collector and I wish I had found this site sooner!

Posted By Beachcomber in September, 2023

Source: Bizrate

Overall Rating -> 9

Never bought anything on this website before, but it probably won't be my last purchase. Definitely one of the easiest to use and most informative sites I've ever been to.

Posted By Bob in November, 2023

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Overall Rating -> 10

Easy to find the stones I was looking for. Always good quality stones

Posted By Erin in June, 2023

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Overall Rating -> 9

Overall good, shipping prices just seem a little on the high side.

Posted By Steve in August, 2023

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 -> 8

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

Posted By MI photo in May, 2023

Source: Bizrate

Overall Rating -> 9

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

Posted By NoHalalAl in March, 2024

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Overall Rating -> 10

The website is easy to search, the variety of gems is excellent and the educational information is interesting and helpful! Love browsing and shopping the GemSelect website!

Posted By Happiness in January, 2024

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Overall Rating -> 10

Excellent experience!

Posted By Steph in April, 2023

Source: Bizrate

Overall Rating -> 10

Always an easy experience using Gem select.

Posted By Jeff in November, 2023

Source: Bizrate

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.

Posted By Kittypie070 in April, 2024

Source: Bizrate

Overall Rating -> 8

Found on a search engine. Scanned inventory and made a small purchase.

Posted By Ralli in August, 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

Source: Bizrate

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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Gemstones A-Z

Buy Round Shape 6.5 mm Gems

24.25 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 20.1 x 15.1 mm

11.85 ct Carved Prehnite, 16.4 x 10.7 mm From South Africa

3.88 ct Pink Morganite, 10.1 mm Round Cut From Afghanistan

3.11 carat White Opal, Oval loose Opal from Australia, Natural Untreated Gem, 13.3 x 9.7 mm

3.77 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6 x 4.1 mm

0.77 ct Loose Pink Sapphire, 7.3 x 5.9 mm Odd Shaped From Tanzania

2.67 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 6.9 x 7 mm

1.76 ct Loose Yellow Sapphire, 5.1 x 2.4 mm Marquise Cut From Tanzania

2.79 ct Loose Orange Moonstone, 14.1 x 6.9 mm Marquise Cut From India

9.1 ct Round Maw-Sit-Sit, 11.2 mm From Myanmar

25.08 ct Round Maw-Sit-Sit, 15.9 mm From Myanmar

6.5 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 17.3 x 12.9 mm

3.44 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gems, 7 x 7 mm

12.52 carat Pear Onyx, loose Certified Onyx from Sri Lanka, Natural Gem, 20 x 15 mm

10.19 ct Diamond Cut Smoky Quartz, 14 mm From Brazil

10.27 ct Asscher Cut Rose Quartz, 13.6 x 13.3 mm From South Africa

12.47 ct Black Spinel, 14.2 x 10.2 mm Oval Rose Cut From Thailand

8.88 ct Oval Cut Prehnite, 16 x 12.1 mm From South Africa

10.06 ct Green Amazonite, 20.1 x 10.4 mm Marquise Cut From Madagascar

1.15 carat Pink Morganite, Pear Shape loose Morganite from Brazil, Natural Untreated Gem, 10.3 x 5.5 mm

6.08 ct Asscher Cut Rose Quartz, 9.2 x 9.1 mm From South Africa

0.69 ct Loose Pink Sapphire, 6.9 x 5.6 mm Odd Shaped From Madagascar

12.91 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 18.7 x 18.5 mm

3 ct Loose Trillion Cut Amethyst, 10.4 x 10.1 mm From Brazil

0.64 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 6 x 4.1 mm

1.64 ct Yellow Quartz, 9.1 x 9 mm Carved From Brazil

22.64 ct Pencil Cut Jasper, 31.3 mm From India

2.16 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.4 mm

2.43 carat Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9.1 x 8.5 mm

0.84 ct Loose Yellow Sapphire, 4.7 x 4.7 mm Heart Cut From Tanzania

1.55 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 6.3 mm

0.84 ct Oval Buff Top Peridot, 7 x 4.9 mm From China

Gemstone Information

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