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

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

I was pleased with the selection of gems, the ease of navigating, and the smooth checkout

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Overall Rating -> 10

Easy to use website, made it very easy to buy. Will shop here again.

Posted By Bjorn in January, 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!

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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

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Overall Rating -> 10

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.

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Overall Rating -> 10

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Posted By Becky in August, 2023

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Overall Rating -> 8

Very easy to find the specific stone I was looking for. I am pleased by both the selection and the price of the stones that are available. The only "bad" thing that I have to say is that the interface of the site is outdated.

Posted By Nick in March, 2024

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Overall Rating -> 10

Easy to navigate

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Overall Rating -> 9

I was in the market for birthstones for a lil gift project im doing. I'm no expert in gems or what not but the quality as far as i can tell seems to be spot on.

Posted By PixelComposer in January, 2024

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Overall Rating -> 10

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023

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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 -> 10

Very large selection of items and we used the stones to have several pieces of jewelry made for us.

Posted By Joe in January, 2024

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Overall Rating -> 10

Very Good

Posted By Julian in July, 2023

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Overall Rating -> 9

Good interaction with site

Posted By Brick in September, 2023

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Gemstones A-Z

Buy Round Shape 12 mm Gems

49.74 ct Cushion Pyrite, 25.6 x 22.6 mm From Russia

8.47 ct Round Cut Smoky Quartz, 13.8 mm From Brazil

0.74 carat Round Grossularite Garnet, loose Certified Grossularite Garnet from Tanzania, Natural Untreated Gem, 5.3 mm

5.48 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 17.6 x 8.8 mm

1.33 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 10.4 x 4 mm

1.72 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5.1 mm

0.05 ct Loose Blue Diamond, 2.4 mm Diamond Cut From India

6.36 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14 x 9.9 mm

1.06 carat Pear Shape Ruby, loose Certified Ruby from Myanmar, Natural Gem, 7.1 x 5.1 mm

0.99 ct Square Cut Color-Change Diaspore, 5.4 x 5.2 mm From Turkey

40.38 ct White Quartz, 47 x 11.8 mm Carved From Brazil

2.12 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 9.3 x 9.2 mm

0.58 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 5 mm

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

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

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

1.63 ct Pink Morganite, 9.3 x 6.9 mm Oval Cut From Afghanistan

34.08 ct Blue Sodalite, 31.9 x 17.7 mm Oval Cut From Australia

14.85 ct Black Spinel, 12 mm Round Rose Cut From Thailand

28.01 carat Black Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 31.4 x 15.9 mm

26.17 ct Pink Smithsonite, 14.9 x 14.7 mm Cushion Cut From Mexico

1.02 ct Purple Spinel, 7 x 5.2 mm Oval Cut From Tanzania

0.85 ct Oval Cut Peridot, 7 x 4.9 mm From China

3.84 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.8 x 9.9 mm

3.09 ct Orange Sunstone, 5.2 mm Round Cut From India

4.4 ct Loose Yellow Sapphire, 5.1 x 2.6 mm Marquise Cut From Tanzania

2.94 ct Oval Prehnite, 8.8 x 7.7 mm From South Africa

2.3 ct Round Cat's Eye Moonstone, 8.2 mm From India

6.46 ct Asscher Cut Rose Quartz, 11.4 x 11.4 mm From South Africa

5.57 ct Yellow Apatite, 12 x 10.8 mm Cushion Cut From Madagascar

4.35 ct Odd Shaped Druzy Variscite, 15.7 x 11 mm From China

2.46 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 9 x 7.1 mm

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