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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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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Gemstones A-Z

Buy Round Shape 13 mm Gems

12.07 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 18 x 13.1 mm

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

1.28 ct Oval Cut Peridot, 8 x 5.9 mm From China

0.02 ct Loose Blue Diamond, 2 mm Diamond Cut From India

6.7 ct Baguette Tiger's Eye, 12.2 x 10.4 mm From Thailand

2.37 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 9 x 7.4 mm

9.17 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.4 x 12.7 mm

0.63 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 5.1 mm

7.28 carat Yellow Citrine, Marquise Cut loose Citrine from Brazil, Natural Untreated Gem, 20.2 x 10.1 mm

5.41 ct Yellow Quartz, 12 mm Round Concave Cut From Brazil

0.65 ct Loose Yellow Sapphire, 6 x 4.1 mm Oval Cut From Tanzania

1.25 ct Oval Cut Rainbow Moonstone, 7.9 x 5.7 mm From the United States

1.01 ct Oval Cut Chrysoberyl, 7.2 x 5.2 mm From Sri Lanka

20.89 ct Drilled Sphere Jasper, 11.7 mm From India

4.13 ct Pink Morganite, 12.6 x 9 mm Oval Cut From Afghanistan

0.62 ct Oval Checkerboard Peridot, 6.1 x 4.1 mm From China

22.71 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 20.2 x 15.3 mm

14.18 ct Black Spinel, 12 mm Round Rose Cut From Thailand

1.04 carat Orange Hessonite Garnet, Round loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6 mm

11.6 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 14 x 9.9 mm

1.13 carat Green Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5.5 x 5.4 mm

1.14 carat Green Sapphire, Pear Shape loose Sapphire from Madagascar, Natural Gem, 8.2 x 6.1 mm

1.23 carat Pear Shape Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6.9 x 4.8 mm

5.7 ct Pink Morganite, 16 x 10 mm Carved From Afghanistan

0.45 ct Loose Orange Sapphire, 5.6 x 3.9 mm Oval Cut From Tanzania

3.79 ct Yellow Agate, 11.3 x 9.5 mm Oval Cut From India

3.25 ct Orange Andesine Labradorite, 10.4 x 8.3 mm Oval Cut From Congo

0.89 carat Orange Citrine, Marquise Cut loose Citrine from Brazil, Natural Untreated Gems, 8.2 x 4.1 mm

0.83 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 8.4 x 3.4 mm

60.57 ct Oval Jasper, 35.2 x 23.3 mm From Indonesia

4.64 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10 x 5.1 mm

16.19 ct Fancy Rainbow Moonstone, 18 x 13.7 mm From the United States

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