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

7.41 ct Carved Prehnite, 16.3 x 12 mm From South Africa

3.3 ct Asscher Cut Smoky Quartz, 9.5 x 9.4 mm From Brazil

43.02 ct Drilled Sphere Rutile Quartz, 14.7 mm From India

9.75 carat Pear Black Opal, loose Certified Black Opal from Ethiopia, Natural Gem, 23.6 x 12 mm

16.36 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.3 x 15.3 mm

9.59 ct Trillion Jasper, 17.3 x 16.8 mm From Mexico

8.28 ct Oval Rainbow Moonstone, 17.7 x 10.9 mm From the United States

0.19 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.6 mm

47.66 ct Drilled Sphere Rhodochrosite, 16.9 mm From South Africa

13.99 ct Baguette Tiger's Eye, 18.2 x 13.3 mm From Thailand

23.4 ct Oval Pietersite, 30 x 21.6 mm From Namibia

4.99 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 12.7 x 12.1 mm

0.47 ct Loose White Sapphire, 4.5 mm Diamond Cut From Madagascar

13.4 ct Loose Pear Dendritic Agate, 16.1 x 12.2 mm From India

6.97 ct Yellow Quartz, 19 x 7.5 mm Octagon Cut From Brazil

0.16 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.3 mm

14.86 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 21.3 x 15.8 mm

1.06 carat Marquise Cut Ruby, loose Certified Ruby from Myanmar, Natural Gem, 8.7 x 4.5 mm

26.78 ct Oval Obsidian, 26.3 x 19.8 mm From the United States

14.46 ct Green Aventurine, 22.4 x 14 mm Oval Cut From Brazil

30.7 ct Oval Pietersite, 30.1 x 22 mm From Namibia

4.35 ct Green Apatite, 8.8 x 8.6 mm Asscher Cut From Madagascar

3.04 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gems, 7.6 x 6.3 mm

12.57 carat Oval Dendritic Agate, loose Certified Dendritic Agate from India, Natural Untreated Gem, 20.1 x 15.2 mm

2.59 ct Yellow Quartz, 9.1 x 9 mm Carved From Brazil

0.88 ct Blue Kyanite, 5.9 mm Round Cut From Nepal

13.12 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 14.9 x 12.3 mm

7 ct Yellow Moonstone, 14.5 x 9 mm Oval Cut From India

0.22 ct Blue Apatite, 3.5 mm Round Cut From Madagascar

36.27 ct Pencil Cut Tiger's Eye, 32.8 mm From Thailand

9.08 ct Cushion Tiger's Eye, 14 x 11.9 mm From Thailand

2.01 ct Orange Moonstone, 7.2 x 7.1 mm Square Cut From India

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