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

0.62 ct Loose Violet Sapphire, 6.5 x 4.4 mm Oval Cut From Tanzania

0.7 carat Round Grossularite Garnet, loose Certified Grossularite Garnet from Tanzania, Natural Untreated Gem, 5.2 mm

21.34 ct Pencil Cut Jasper, 32.9 x 9.8 mm From Indonesia

5.72 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 10.1 x 8 mm

1.56 carat Yellow Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gems, 8.2 x 6 mm

3.15 ct Fancy Fire Agate, 12.9 x 7 mm From Mexico

6.7 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 14.3 mm

2.44 ct Oval Tiger's Eye, 8 x 6.1 mm From Thailand

1.81 ct Oval Cut Strawberry Quartz, 9 x 7 mm From Russia

1.35 carat Pear Shape Color-Change Diaspore, loose Certified Color-Change Diaspore from Turkey, Natural Untreated Gem, 9.5 x 5.5 mm

0.49 ct Loose Yellow Sapphire, 6.1 x 4.1 mm Oval Cut From Tanzania

1.09 carat Yellow Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gems, 6.1 x 4 mm

3.7 ct Loose Oval Malachite, 10.1 x 7.3 mm From Congo

2.27 ct Loose Yellow Sapphire, 7.7 x 7.2 mm Oval Cut From Thailand

24.46 ct Oval Rainbow Moonstone, 26.8 x 16 mm From the United States

42.99 ct Yellow Quartz, 35.3 x 22.3 mm Carved From Brazil

9.66 ct Fancy Boulder Opal, 26.4 x 12.5 mm From Australia

5.35 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.2 x 4.2 mm

0.78 carat Oval Peridot, loose Certified Peridot from China, Natural Untreated Gem, 7 x 5 mm

16.38 ct Cushion Larimar, 23.9 x 22.6 mm From the Dominican Republic

13.06 ct Violet Jadeite, 19 x 13.1 mm Oval Cut From Myanmar

3.97 carat Yellow Citrine, loose Citrine from Brazil, Natural Untreated Gem, 11.4 x 10.1 mm

1.63 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 8.5 x 5.5 mm

3.37 ct Round Checkerboard Smoky Quartz, 7.9 mm From Brazil

0.85 carat Blue Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 4.2 mm

2.37 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 9.2 x 7.4 mm

1.59 ct Yellow Beryl, 8.2 mm Round Cut From Madagascar

17.26 ct Oval Opal in Matrix, 23.9 x 14.7 mm From Honduras

28.12 ct Green Jadeite, 40.5 x 14.7 mm Carved From Myanmar

1.32 carat Opal, loose Certified Opal from Ethiopia, Natural Gem, 8 x 5.9 mm

2.21 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7.2 x 5.3 mm

0.62 carat Emerald Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 5.5 x 4.5 mm

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