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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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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I had a great time searching all the lovely stones. This is my first precious loose stone purchase for my own work. I chose sapphire, and found some lovely briolettes. I wanted 3, but this set of 4 was perfect. Everything was quick and easy, and I'm excited.

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Gemstones A-Z

Buy Round Shape 12 mm Gems

11.16 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 23.6 x 7.4 mm

2.46 ct Blue Kyanite, 10.6 x 7 mm Cushion Cut From Nepal

4.01 ct Green Agate, 18 x 9.7 mm Carved From India

1.45 ct Purple Spinel, 6.7 x 6.3 mm Oval Cut From Tanzania

0.64 carat Green Sapphire, Cushion loose Sapphire from Tanzania, Natural Gem, 4.6 x 4.5 mm

1.14 ct Oval Sillimanite Cat's Eye, 6.3 x 5.9 mm From Madagascar

1.18 ct Yellow Sphene, 6.3 x 5.6 mm Oval Cut From Sri Lanka

4.46 carat Sky Blue Topaz, loose Topaz from Brazil, Natural Gems, 7.1 x 5.1 mm

19.29 ct Oval Checkerboard Labradorite, 19.5 x 15.1 mm From Madagascar

2.36 ct Round Cut Strawberry Quartz, 7 mm From Russia

4 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12.1 x 6 mm

4.26 ct Pink Morganite, 8.1 mm Round Cut From Afghanistan

5.75 carat Blue Zircon, Pear Shape loose Zircon from Cambodia, Natural Gem, 11.8 x 9.2 mm

19.33 carat Pear Hematite, loose Certified Hematite from Brazil, Natural Untreated Gem, 20.7 x 13.6 mm

6.13 carat Briolette Tourmaline, loose Certified Tourmaline from Mozambique, Natural Untreated Gems, 6.5 mm

1.61 ct Yellow Diamond, 7 mm Diamond Cut From South Africa

21.89 ct Cushion Jasper, 17.5 x 14.4 mm From Indonesia

2.09 ct Orange Sunstone, 9.3 x 7.5 mm Oval Cut From India

0.73 ct Oval Cut Peridot, 7 x 4.8 mm From China

11.7 ct Baguette Tiger's Eye, 18.1 x 13.3 mm From Thailand

2.28 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.2 x 4.2 mm

2.49 ct Oval Sillimanite Cat's Eye, 7.2 x 5.1 mm From Madagascar

2.35 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5 mm

1.3 ct Cushion Cut Color-Change Diaspore, 9.4 x 4.3 mm From Turkey

0.87 carat London Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 7 x 5 mm

113.09 ct Cushion Chrysocolla, 49.6 x 33.9 mm From Australia

3.57 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10.8 x 9 mm

5.4 carat Black Tourmaline, Oval loose Tourmaline from Tanzania, Natural Untreated Gem, 11.4 x 9.7 mm

8.61 ct Oval Star Ruby, 12.7 x 9.9 mm From Madagascar

9.62 ct Oval Cut Strawberry Quartz, 12.1 x 10.1 mm From Russia

2.72 ct Red Agate, 7.8 x 6.1 mm Oval Cut From India

1.87 ct Yellow Beryl, 9.1 x 8.8 mm Trillion Cut From Madagascar

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