Calibrated 8 mm Round Shape Loose Natural 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 8 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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Gemstones A-Z

Buy Round Shape 8 mm Gems

57.73 ct Baguette Hematite, 18.2 x 14.5 mm From Brazil

1.27 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 5.1 mm

4.59 carat Swiss Blue Topaz, Round loose Topaz from Brazil, Natural Gems, 8.1 mm

5.45 ct Round Cut Smoky Quartz, 12 mm From Brazil

1.56 ct Loose White Sapphire, 4.3 mm Diamond Cut From Madagascar

0.17 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.5 mm

0.46 ct Blue Kyanite, 3.7 mm Round Cut From Nepal

4.05 ct Blue Star Sapphire, 7 x 5.1 mm Oval Cut From Thailand

11.71 ct Oval Coral, 19.7 x 14.8 mm From Indonesia

6.09 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 11.7 x 9.5 mm

1.01 ct Oval Cut Peridot, 7 x 5 mm From China

8.5 ct Loose Princess Cut Sapphire, 2.9 x 2.9 mm From Tanzania

16.16 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 24.7 x 15.7 mm

3.88 ct Green Agate, 11.2 x 9.1 mm Oval Cut From India

0.82 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 8.4 x 4.6 mm

2.43 ct Oval Tiger's Eye, 9 x 7 mm From Thailand

2.67 ct Yellow Sphene, 8.6 x 8 mm Oval Cut From Sri Lanka

3.8 ct Blue Star Sapphire, 7 x 5.1 mm Oval Cut From Thailand

16.81 carat Cameo Mother of Pearl, loose Certified Mother of Pearl from China, Natural Gem, 24.4 mm

0.68 carat Green Tourmaline, Baguette Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 6.6 x 4.1 mm

9.33 ct Loose Round Agate, 12.3 mm From Indonesia

27.45 ct Baguette Hematite, 19.4 x 13.9 mm From Brazil

0.29 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.7 mm

1.12 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 9.1 x 7 mm

21.08 ct Baguette Rainbow Moonstone, 20.7 x 15.1 mm From the United States

5.72 ct Odd Shaped Druzy Variscite, 17.8 x 12.6 mm From China

4.7 ct Black Star Sapphire, 9.2 x 8.2 mm Oval Cut From Thailand

17.35 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gems, 21.1 x 14.6 mm

13.48 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 22.5 x 12.9 mm

0.79 ct Blue Kyanite, 5.8 mm Round Cut From Nepal

2.15 carat Princess-Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8 x 7.9 mm

0.68 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 8.2 x 4.1 mm

Gemstone Information

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