Buy 12 mm Round Calibrated 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 12 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

Easy and fast

Posted By Mark in February, 2024

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Overall Rating -> 10

Very easy. I have purchased a few times before and was satisfied each time. Thank you.

Posted By Ray in December, 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

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

Posted By C.J. in February, 2024

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Overall Rating -> 10

The website was very easy to navigate. We appreciated the details about each gem, and the sort and search features of the website were helpful and easy to use.

Posted By AV in May, 2023

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Overall Rating -> 9

Well presented images, clear information, quick and easy check out.

Posted By Mr. Bezel in July, 2023

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Overall Rating -> 9

Easy to use. Limited supply of higher quality gemstones.

Posted By Newfguy in February, 2024

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Overall Rating -> 10

Great Job today! No issues!

Posted By Samlovesgems777 in August, 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

Always an easy experience using Gem select.

Posted By Jeff in November, 2023

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Overall Rating -> 10

My overall interaction with your website was pleasant, as always.

Posted By RJ in April, 2024

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Overall Rating -> 9

Good interaction with site

Posted By Brick in September, 2023

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Overall Rating -> 10

Everything fine.

Posted By Hilario in December, 2023

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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

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

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Gemstones A-Z

Buy Round Shape 12 mm Gems

2.78 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.2 x 4.1 mm

0.46 carat Yellow Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6 x 4 mm

3.18 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9 x 7.1 mm

0.5 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5.2 x 4.1 mm

2.07 carat Orange Moonstone, Pear Shape loose Moonstone from India, Natural Untreated Gems, 9.2 x 6.1 mm

0.55 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6.1 x 4.1 mm

8.27 ct Oval Strawberry Quartz, 13.2 x 10.9 mm From Russia

34.04 carat Pear Hematite, loose Certified Hematite from Brazil, Natural Untreated Gem, 23.8 x 17.7 mm

1.17 carat Purple Tourmaline, Oval loose from Mozambique, Natural Untreated Gem, 7.6 x 5.7 mm

10.92 ct Loose Pear Bloodstone, 18.8 x 13.2 mm From Madagascar

1.21 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 14.9 x 3.2 mm

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

2.56 ct Loose Yellow Sapphire, 2.6 x 2.6 mm Princess Cut From Tanzania

3.55 ct Round Labradorite, 7.2 mm From Madagascar

4.98 carat Sky Blue Topaz, Emerald Cut loose Topaz from Brazil, Natural Gems, 8.8 x 6.9 mm

45.97 ct Brown Jasper, 25.4 x 25.3 mm Cushion Cut From India

1.34 ct Purple Spinel, 6.2 x 5.4 mm Cushion Cut From Tanzania

5.44 ct Green Agate, 12.2 x 10.1 mm Octagon Cut From India

1.17 ct Oval Sillimanite Cat's Eye, 7.8 x 5.2 mm From Madagascar

6.48 ct Oval Prehnite, 10.6 x 8.5 mm From South Africa

5.4 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 10.3 x 8.2 mm

3.41 carat Red Zircon, Pear Shape loose Zircon from Tanzania, Natural Untreated Gem, 8.5 x 8 mm

4.44 carat Pear Shape Opal, loose Certified Opal from Australia, Natural Untreated Gem, 12.7 x 12.7 mm

0.88 ct Oval Sillimanite Cat's Eye, 6.9 x 4.5 mm From Madagascar

0.45 carat Bi-color Tourmaline, Baguette Sugarloaf Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 6.4 x 3.7 mm

4.96 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 11.3 x 8.5 mm

2.31 ct Loose Yellow Sapphire, 4.9 mm Round Cut From Tanzania

1 carat Purple Spinel, Pear Shape loose Spinel from Tanzania, Natural Untreated Gem, 7.8 x 5.4 mm

1.29 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6 x 5.8 mm

5.39 ct Loose Oval Star Ruby, 10.1 x 8.7 mm From Madagascar

5.78 ct Loose Pink Kunzite, 11.7 x 5.9 mm Octagon Cut From Afghanistan

1.47 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.9 x 7.1 mm

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