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

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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Overall Rating -> 10

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

Posted By KRJ in July, 2023

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Overall Rating -> 10

love yall

Posted By Rock hunter in August, 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.

Posted By Kittypie070 in April, 2024

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Overall Rating -> 10

I love the clear description of the certification options. It's very rare to see a gem site that offers a deep explanation of each institution that would certify the stone(s).

Posted By Oakcityceo in May, 2023

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Overall Rating -> 10

great. thank you

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Overall Rating -> 10

Trustworthy site. I've had several good experiences with company. Products always have met my expectations. Thank you.

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Overall Rating -> 10

Great website and information

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Overall Rating -> 10

this was very easy im exited to get my order

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Overall Rating -> 10

I have started a small gem brokerage. I find stones to meet clients needs. Gemselect has helped me find what people what.

Posted By Pirates Bounty in April, 2024

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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 -> 7

I feel pretty good so far, pending the delivery of the item ordered.

Posted By Steve in November, 2023

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Overall Rating -> 10

Love the variety of stones, sizes and the prices

Posted By Dorita in March, 2024

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Overall Rating -> 10

Perfect size I was looking for and great price

Posted By Izzy in September, 2023

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Overall Rating -> 8

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Gemstones A-Z

Buy Round Shape 12 mm Gems

0.36 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.8 mm

1.53 carat Orange Zircon, Oval loose Zircon from Cambodia, Natural Untreated Gem, 7.4 x 5.6 mm

4.05 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.1 mm

10.87 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 15.1 x 9.1 mm

0.06 ct Green Diamond, 2.4 mm Diamond Cut From India

1.1 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 7.1 x 6.9 mm

7.53 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gems, 8.1 x 6.1 mm

1.13 carat Red Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.4 x 5.8 mm

1.09 ct Marquise Cut Color-Change Diaspore, 10.7 x 4.7 mm From Turkey

0.3 carat Blue Kyanite, Round loose Kyanite from Nepal, Natural Untreated Gem, 4 mm

19.38 ct Fancy Jasper, 29.2 x 16.7 mm From Indonesia

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

12.27 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 20.1 x 15 mm

4.78 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gem, 15.7 x 9.4 mm

11.08 ct Round Cut Color-Change Fluorite, 14.1 mm From Brazil

1.48 ct Oval Cat's Eye Moonstone, 9.1 x 6.9 mm From India

0.64 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 5.2 mm

2.12 ct Pink Morganite, 8.1 x 6 mm Oval Cut From Afghanistan

5.41 carat Marquise Cut Labradorite, loose Certified Labradorite from Madagascar, Natural Untreated Gem, 15.9 x 8 mm

4.72 ct Yellow Moonstone, 10.1 x 8.3 mm Oval Cut From India

2.54 ct Cushion Checkerboard Peridot, 9.7 x 7.7 mm From China

1.1 carat Oval Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gem, 7.4 x 5.5 mm

1.82 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 8 x 8 mm

1.25 ct Loose Orange Moonstone, 10.1 x 5.3 mm Marquise Cut From India

1.92 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 7 mm

1.68 carat Pink Tourmaline, Round Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 7.2 mm

2.29 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.1 x 4.2 mm

5.83 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.1 x 9.1 mm

0.93 carat Pink Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 9.1 x 5.5 mm

3.04 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.3 x 9.2 mm

20.96 ct Marquise Concave Cut Smoky Quartz, 19.7 x 12.5 mm From Brazil

6.28 carat Pear Shape Smoky Quartz, loose Certified Smoky Quartz from Brazil, Natural Untreated Gem, 15.1 x 10.9 mm

Gemstone Information

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