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

21.03 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 19.9 x 15.2 mm

50.32 ct Fancy Chrysocolla, 35.9 x 25.9 mm From Australia

25.9 carat Bi-color Ametrine, Pear Shape loose Ametrine from Brazil, Natural Untreated Gem, 22.8 x 18.3 mm

4.87 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 13.9 x 10 mm

0.4 ct Loose Pink Sapphire, 5.2 x 4.1 mm Odd Shaped From Tanzania

1.32 ct Round Tiger's Eye, 6.6 mm From Thailand

8.68 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 14 x 8.1 mm

2.07 ct Orange Moonstone, 7.1 x 7 mm Cushion Cut From India

1.25 carat Pear Shape Mystic Quartz, loose Certified Mystic Quartz from Brazil, Natural Gems, 7 x 5 mm

0.36 ct Loose Yellow Sapphire, 5 x 3.1 mm Octagon Cut From Tanzania

2.68 ct Loose Pink Tourmaline, 8.5 x 6 mm Oval Cabochon From Mozambique

5.14 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14.1 x 10 mm

8.1 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gem, 22.5 x 13.7 mm

3.05 ct Oval Concave Cut Mystic Quartz, 11.1 x 9 mm From Brazil

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

1.64 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gem, 7 x 6.9 mm

0.38 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 4.1 mm

6.64 ct Drilled Square Rondelle Labradorite, 5 x 5 mm From Madagascar

12.29 ct Black Spinel, 11.9 mm Round Rose Cut From Thailand

0.41 carat Green Sapphire, Emerald-Cut loose Sapphire from Tanzania, Natural Gem, 5.1 x 3.3 mm

0.33 ct Blue Kyanite, 3.7 mm Round Cut From Nepal

2.92 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.4 x 8.6 mm

3.4 carat Blue Zircon, Oval loose Zircon from Cambodia, Natural Gem, 8.8 x 7 mm

5.27 carat Yellow Citrine, Emerald Cut loose Citrine from Bolivia, Natural Untreated Gem, 11.5 x 10 mm

7.29 carat Carved Leaf Ruby, loose Certified Ruby from Madagascar, Natural Gems, 13.5 x 9.8 mm

12.38 ct Baguette Tiger's Eye, 12.1 x 10.1 mm From Thailand

0.95 ct Yellow Sphene, 5.9 x 5.3 mm Oval Cut From Sri Lanka

18.82 ct Yellow Quartz, 13.3 x 13.3 mm Carved From Brazil

4.49 ct White Moonstone, 11.7 x 9.7 mm Oval Cut From India

4.67 ct White Moonstone, 8.2 mm Round Cut From India

9.34 ct Oval Coral, 16.4 x 14.8 mm From Indonesia

9.22 carat Pear Rutile Quartz, loose Certified Rutile Quartz from India, Natural Untreated Gem, 16 x 12.2 mm

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