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 -> 10

The site is very easy to use and I will continue to shop here. The quality is superb

Posted By Genia in January, 2024

Source: Bizrate

Overall Rating -> 10

I have used Gem Select many times over the past 10 years and have always been happy with the product & services

Posted By Ordain in August, 2023

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Overall Rating -> 10

Overall, the whole process was just great.

Posted By Thatoneguy in August, 2023

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Overall Rating -> 8

I did not realize how small the stone was. I cannot use it for the project I wanted, but I am keeping the stone and tru to use it in something else.

Posted By Mark in March, 2024

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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

Very good customer service. I had an issue on my end with shipping and I received a response the next day!

Posted By Orphanboy in December, 2023

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Overall Rating -> 10

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

Posted By Terry in June, 2023

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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.

Posted By ChiChi in January, 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

The gem stone always has a great selection of beautiful stones. The calibrated stone fit my ring perfectly. Thank you gem select !

Posted By Jen in August, 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

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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!

Posted By JAB93 in June, 2023

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Overall Rating -> 9

It went well

Posted By Rob in December, 2023

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Overall Rating -> 10

Everything fine.

Posted By Hilario in December, 2023

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Overall Rating -> 10

Very good, very fast, everything as described.

Posted By B in October, 2023

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Gemstones A-Z

Buy Round Shape 6.5 mm Gems

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

6.36 carat Pear Larimar, loose Certified Larimar from the Dominican Republic, Natural Untreated Gem, 14.2 x 10.2 mm

1.77 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 8.8 x 6.9 mm

1.8 ct Yellow Sphene, 8.7 x 6.6 mm Oval Cut From Sri Lanka

1.57 ct Green Sphene, 7 x 6.1 mm Oval Cut From Sri Lanka

1.81 ct Round Cut Strawberry Quartz, 8 mm From Russia

1.07 ct Oval Sillimanite Cat's Eye, 6.9 x 4.7 mm From Madagascar

0.53 ct Loose Orange Sapphire, 6 x 4.1 mm Oval Cut From Tanzania

8.72 carat Pear Shape Mystic Quartz, loose Certified Mystic Quartz from Brazil, Natural Gem, 18.1 x 12.8 mm

50.09 ct Cushion Charoite, 29.6 x 25.6 mm From Russia

0.34 ct Loose Orange Sapphire, 4.5 x 4.3 mm Heart Cut From Tanzania

1.45 ct Yellow Beryl, 8.1 mm Round Cut From Madagascar

0.87 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gem, 7 x 4.9 mm

84.82 ct Oval Jasper, 41.6 x 31.5 mm From Indonesia

1.36 ct Loose Orange Sapphire, 7.8 x 6 mm Oval Cut From Madagascar

4.51 ct Blue Star Sapphire, 7 x 5.2 mm Oval Cut From Thailand

0.7 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.5 mm

5.13 ct Orange Sunstone, 10.9 mm Round Cut From India

0.95 carat Orange Hessonite Garnet, Pear Shape loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.7 x 5.6 mm

1.62 ct Oval Cut Fire Opal, 9 x 7.4 mm From Mexico

0.5 ct Loose Orange Sapphire, 4.2 x 4.2 mm Cushion Cut From Tanzania

6.43 ct Trillion Pietersite, 16.5 x 14.9 mm From Namibia

1.62 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 5.2 x 5.1 mm

6.48 ct Oval Star Moonstone, 14.5 x 8.4 mm From India

2.11 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 9 x 8.9 mm

3.4 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10.9 x 8.8 mm

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

0.92 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 7.9 x 4.1 mm

2.54 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 7.2 x 7 mm

6.84 ct Yellow Quartz, 14.5 x 8 mm Octagon Cut From Brazil

2.19 ct Green Sphene, 8.2 x 6.6 mm Oval Cut From Sri Lanka

0.44 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 6 x 4.1 mm

Gemstone Information

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