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

4.16 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 13.9 x 8.1 mm

2.64 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.1 x 10 mm

2.18 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.2 x 7.1 mm

4.2 ct Round Cut Smoky Quartz, 10.8 mm From Brazil

9.6 ct Round Cut Smoky Quartz, 14.9 mm From Brazil

0.62 ct Purple Spinel, 5 mm Round Cut From Tanzania

3.81 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 12.1 x 8.1 mm

2.04 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gems, 6.2 x 6.1 mm

7.59 carat Pear Pietersite, loose Certified Pietersite from China, Natural Untreated Gems, 16.9 x 11.3 mm

1.49 carat Marquise Cut Ruby, loose Certified Ruby from Myanmar, Natural Gem, 10.1 x 5.1 mm

1.63 ct Yellow Beryl, 8 mm Round Cut From Madagascar

1.39 ct Loose Marquise Labradorite, 10 x 5.1 mm From Madagascar

14.24 ct Black Spinel, 14.1 x 10 mm Oval Rose Cut From Thailand

6.95 ct White Quartz, 12.7 mm Diamond Cut From Brazil

10.12 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 15.4 x 12.7 mm

40.8 ct Loose Oval Bloodstone, 40 x 26.9 mm From Madagascar

10.15 ct Oval Star Ruby, 12.8 x 10.8 mm From Madagascar

3.4 ct Yellow Quartz, 12.8 x 12.8 mm Carved From Brazil

3.12 carat Yellow Citrine, Cushion loose Citrine from Brazil, Natural Untreated Gem, 10.5 x 8.1 mm

2.27 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 16.7 x 4.1 mm

1.35 ct Orange Sunstone, 8 x 6.1 mm Oval Cut From India

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

9.49 ct Flower Cut Prehnite, 13.5 x 13.4 mm From South Africa

3.25 ct Loose Baguette Labradorite, 9.1 x 7.2 mm From Madagascar

5.85 ct Carved Prehnite, 16.2 x 10.7 mm From South Africa

19.06 ct Oval Jasper, 23.7 x 16.7 mm From Indonesia

1.68 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 8.1 x 6.1 mm

1.46 ct Loose Violet Sapphire, 7.3 x 5.4 mm Cushion Cut From Tanzania

2.52 ct Loose Oval Malachite, 9 x 7.3 mm From Congo

3.57 ct Oval Strawberry Quartz, 10 x 8.1 mm From Russia

32.26 ct Cushion Fossil Coral, 20.1 x 12.3 mm From Indonesia

3.29 carat Blue Green Fluorite, Oval loose Fluorite from India, Natural Untreated Gem, 9.1 x 7 mm

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