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 website is easy to navigate and the images are incredible.

Posted By Lindsy in October, 2023

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Overall Rating -> 10

Great experience! First time buyer

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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

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

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Overall Rating -> 9

Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

Posted By Erick in July, 2023

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Overall Rating -> 10

Very detailed and great pictures

Posted By Alexandrite in November, 2023

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Overall Rating -> 10

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

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Overall Rating -> 10

Great site

Posted By Lord of Bananas in November, 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.

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Overall Rating -> 10

Very good, very fast, everything as described.

Posted By B in October, 2023

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I have used gm select a while ago and was always pleased with the products

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Overall Rating -> 10

Everything was fine.

Posted By Matt in March, 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

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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

I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

Posted By Papa in December, 2023

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Gemstones A-Z

Buy Round Shape 6.5 mm Gems

0.18 ct Square Cut Kornerupine, 3.2 x 3.2 mm From Sri Lanka

34.24 ct Oval Cut Nuummite, 24.9 x 17.7 mm From India

4.35 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 9.9 x 5 mm

4.68 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14.2 x 10.1 mm

0.23 ct Black Diamond, 3.5 mm Diamond Cut From India

1.34 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.3 x 6 mm

2.63 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.2 x 5.2 mm

15.88 ct Oval Checkerboard Labradorite, 18.1 x 12.9 mm From Madagascar

2.16 carat White Opal, Pear Shape loose Opal from Australia, Natural Untreated Gem, 12.3 x 8.4 mm

6.39 ct Yellow Quartz, 12 mm Round Concave Cut From Brazil

4.26 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gems, 7 x 4.9 mm

0.53 ct Loose Purple Sapphire, 4.9 x 3 mm Oval Cut From Tanzania

2.21 carat Green Fluorite, Pear Shape loose Fluorite from India, Natural Untreated Gem, 9.5 x 7.3 mm

59.84 ct Oval Jasper, 35.3 x 23.3 mm From India

9.28 ct Cushion Tiger's Eye, 14 x 11.9 mm From Thailand

46.61 ct Yellow Quartz, 28.8 x 20.9 mm Oval Cut From Brazil

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

3.79 ct Round Checkerboard Smoky Quartz, 8.2 mm From Brazil

1.94 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.2 x 6.8 mm

1.33 ct Marquise Checkerboard Peridot, 7.9 x 4.1 mm From China

90.42 ct Yellow Quartz, 33.9 x 22.6 mm Oval Portuguese Cut From Brazil

6.9 ct Oval Malachite, 12.1 x 10 mm From Congo

4.41 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.8 x 9.8 mm

3.86 carat Black Tourmaline, Oval loose Tourmaline from Tanzania, Natural Untreated Gem, 11.6 x 8.9 mm

3.01 ct Square Cut Rainbow Moonstone, 3.1 x 3.1 mm From India

1.74 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.9 x 5.9 mm

1.26 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.3 x 6.1 mm

4.37 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.2 x 10 mm

10.17 ct Carved Rose Quartz, 22.1 x 14 mm From Brazil

2.62 carat Square Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 5 x 4.9 mm

10.87 carat Gray Pearl, Baroque loose Pearl from South Sea, Natural Gem, 12.3 mm

1.62 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6 x 4.1 mm

Gemstone Information

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