Buy 13 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 13 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 13 mm Gems

7.8 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.1 mm

1.67 ct Oval Strawberry Quartz, 8.2 x 6.3 mm From Russia

1.79 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gems, 3.5 mm

0.32 ct Oval Chrysoberyl Cat's Eye, 3.3 x 3.3 mm From Sri Lanka

2.92 ct Loose Yellow Sapphire, 4.9 mm Round Cut From Tanzania

0.47 ct Loose Orange Sapphire, 6.2 x 4.2 mm Oval Cut From Tanzania

7.49 ct Octagon Cut Smoky Quartz, 11.6 x 11.6 mm From Brazil

0.6 ct Loose Orange Sapphire, 6.1 x 4.2 mm Oval Cut From Tanzania

26.57 ct Oval Rainbow Moonstone, 23.8 x 17.8 mm From the United States

6.8 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.8 x 10.7 mm

1.46 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Gem, 9 x 7 mm

1.55 ct Loose Yellow Sapphire, 5 mm Round Cut From Tanzania

3.7 ct Diamond Cut Andalusite, 3.6 mm From Brazil

1.45 ct Purple Spinel, 6.6 x 6.3 mm Cushion Cut From Tanzania

0.57 ct Oval Cut Color-Change Diaspore, 6.4 x 4.2 mm From Brazil

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

8.32 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 14.1 x 8.2 mm

2.57 carat Orange Hessonite Garnet, Round loose Hessonite Garnet from Sri Lanka, Natural Untreated Gems, 6.1 mm

1.21 ct Oval Peridot, 6 x 4.2 mm From China

14.42 ct Pink Morganite, 16.7 x 16.2 mm Trillion Cut From Afghanistan

3.29 carat Blue Zircon, Round loose Zircon from Cambodia, Natural Gem, 8.1 mm

17.5 carat Carved Rose Mother of Pearl, loose Certified Mother of Pearl from China, Natural Gem, 22.6 x 16.5 mm

21.29 ct Oval Rose Quartz, 22.8 x 13.2 mm From South Africa

0.63 carat Emerald Cut Color-Change Garnet, loose Certified Color-Change Garnet from Madagascar, Natural Untreated Gem, 7 x 3.5 mm

1.43 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 9.1 x 7.1 mm

3.46 ct Loose Orange Sapphire, 4.6 x 2.5 mm Marquise Cut From Tanzania

0.94 ct Pink Morganite, 6.2 x 6.8 mm Heart Cut From Afghanistan

2.92 carat White Topaz, Cushion loose Topaz from Brazil, Natural Untreated Gems, 4.6 x 4.5 mm

2.66 carat Red Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 10.2 x 8.1 mm

17.89 ct Loose Oval Lapis Lazuli, 16.5 x 12.9 mm From Afghanistan

7.59 ct Black Star Sapphire, 11.8 x 9.2 mm Oval Cut From Thailand

0.32 ct Oval Cut Kornerupine, 4.8 x 3.8 mm From Sri Lanka

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