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

Great selection

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Easy to use,I have spent many hours looking at the site

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Website was incredibly easy and fast to use. Navigation and product outlay was simple and enjoyable to browse. Thank you and have a blessed day!

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My first order. I am anxious to see if what I ordered is what I receive.

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Overall Rating -> 10

the searching format was easy to find what i needed. It helped to be able to sort Lowest price to Highest because i wasnt looking to spend too much but i did want an actual stone and not imitation.

Posted By PixelComposer in January, 2024

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Overall Rating -> 10

The website is user friendly, has excellent selection. I've always found what I was looking for with Gem Select. When others don't have it they do. And most important, they have a way for you to pay without using PayPal. I cannot use PayPal they closed my account because of no cell phone.

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Overall Rating -> 10

Found the stone I wanted which was delivered quickly and met expectations.

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Very good, very fast, everything as described.

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all good

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Overall Rating -> 10

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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Overall Rating -> 10

Overall, the whole process was just great.

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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.

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Overall Rating -> 10

Extremely easy to use, and I am fully satisfied with the purchase process.

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Gemstones A-Z

Buy Round Shape 12 mm Gems

0.39 ct Loose Orange Sapphire, 4.8 x 2.6 mm Marquise Cut From Tanzania

0.8 carat London Blue Topaz, Square loose Topaz from Brazil, Natural Gem, 5 x 5 mm

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

2.3 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.1 mm

1.04 carat Oval Ruby, loose Certified Ruby from Myanmar, Natural Gem, 6.8 x 5.2 mm

9.66 ct Yellow Quartz, 11.5 x 10.9 mm Octagon Cut From Brazil

85.13 ct Pyramid Cut Agate, 28 x 27.6 mm From Indonesia

3.11 ct Yellow Sillimanite, 7.9 x 5.8 mm Oval Cut From Sri Lanka

5.53 carat Yellow Citrine, Emerald Cut loose Citrine from Bolivia, Natural Untreated Gem, 12.1 x 8.1 mm

8.32 carat Pear Quartz With Marcasite, loose Certified Quartz With Marcasite from Brazil, Natural Untreated Gem, 17.9 x 12.1 mm

14.24 ct Baguette Tiger's Eye, 18.3 x 13.5 mm From Thailand

4.43 carat White Topaz, Cushion loose Topaz from Brazil, Natural Untreated Gems, 4.6 x 4.5 mm

2.82 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.6 x 7.6 mm

3.24 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.1 x 10.1 mm

5.43 ct Round Larimar, 11.4 mm From the Dominican Republic

4.16 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.1 mm

3.45 ct Blue Star Sapphire, 7 x 5 mm Oval Cut From Thailand

1.87 ct Round Tiger's Eye, 7.9 mm From Thailand

1.76 carat Yellow Citrine, Carved Flower loose Citrine from Brazil, Natural Untreated Gem, 7.8 x 7.7 mm

2.74 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4 x 4 mm

6.68 ct Green Agate, 13.1 x 11.6 mm Oval Cut From India

0.82 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 10.6 x 3.3 mm

1 ct Marquise Checkerboard Peridot, 8.1 x 4.1 mm From China

2.52 carat Yellow Tourmaline, Cushion Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 8.9 x 7.1 mm

6.35 ct Marquise Concave Cut Smoky Quartz, 25.3 x 9.1 mm From Brazil

0.52 ct Loose White Sapphire, 5.3 x 4 mm Oval Cut From Tanzania

13.26 carat Pear Moss Agate, loose Certified Moss Agate from India, Natural Untreated Gem, 27.7 x 18 mm

14.3 ct Round Cut Smoky Quartz, 16 mm From Brazil

0.96 ct Yellow Sphene, 6.3 x 5.1 mm Oval Cut From Sri Lanka

1.09 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 10 x 4.9 mm

2.21 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gems, 6.1 x 6.1 mm

41.62 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 38.2 x 33.5 mm

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