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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all good

Posted By John in December, 2023

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

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Easy to find products I want. I've ordered several times from gem select and never any problems. Will order again. Thank you.

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The website is easy to navigate and has a great selection. I am an amateur silver smith casting jewelry with stones

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I have had and will always have a great time shopping at GemSelect. It's a great web site with great products and great service.

Posted By Apps in November, 2023

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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.

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Overall Rating -> 10

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Gemstones A-Z

Buy Round Shape 12 mm Gems

12.04 ct Oval Buff Top Chalcedony, 14 x 9.9 mm From Brazil

22.32 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 19.7 x 15.1 mm

15.38 ct Oval Pietersite, 24 x 17.1 mm From Namibia

2.6 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 x 9.9 mm

21.23 ct Gray Star Sapphire, 14.7 mm Round Cut From Myanmar

1.03 ct Loose Orange Sapphire, 4.2 x 4.1 mm Trillion Cut From Tanzania

11.12 carat Black Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 15.4 x 12 mm

2.88 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6 x 4.2 mm

13.53 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gem, 24.4 x 14.1 mm

0.51 ct Orange Sphalerite, 4.6 mm Round Cut From Spain

3.8 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 7 mm

6.12 ct Odd Shaped Rainbow Pyrite, 14.9 x 11.8 mm From Russia

7.02 ct Yellow Quartz, 10.7 x 10.6 mm Carved From Brazil

5.18 ct Oval Tiger's Eye, 14.2 x 10.4 mm From India

0.83 ct Green Sphene, 6.3 x 4.9 mm Oval Cut From Sri Lanka

3.18 ct Oval Prehnite, 7.5 x 5.8 mm From South Africa

7.25 ct White Moonstone, 9.1 mm Round Cut From India

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

3.5 ct Round Checkerboard Smoky Quartz, 8 mm From Brazil

1.68 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.1 mm

1.82 ct Blue Apatite, 5.7 x 4.8 mm Oval Cut From Madagascar

0.48 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6 x 4 mm

1.23 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 5.1 x 4.2 mm

4.53 ct Loose Oval Cut Strawberry Quartz, 12.1 x 9.9 mm From India

6.89 ct Oval Star Ruby, 12 x 10.2 mm From Madagascar

13.21 ct Black Spinel, 11.6 mm Round Rose Cut From Thailand

5.84 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 11.8 mm

58.72 ct Oval Jasper, 35.2 x 23.2 mm From Indonesia

2.04 ct Round Onyx, 5.6 mm From Sri Lanka

0.18 ct Yellow Diamond, 3.6 mm Diamond Cut From Brazil

0.5 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6.1 x 4.1 mm

4.62 ct Brown Diamond, 7.4 x 7.2 mm Princess Cut From South Africa

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