Calibrated Square Cut Gemstones in Size 13x13 mm

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 Square shapes, facet cut and cabochon gems available now in 13 mm x 13 mm 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 meant nor 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 Square Shape 13x13 mm Gems

3.32 ct Loose Pear Dendritic Agate, 14.2 x 10.4 mm From India

6.03 ct Marquise Ruby-Zoisite, 22 x 7.8 mm From Tanzania

1.68 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.9 x 3.5 mm

11.48 ct Oval Star Ruby, 14.1 x 11.4 mm From Madagascar

2.97 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10.1 x 5.2 mm

7.18 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 14.1 x 7 mm

4.18 ct Loose Princess Cut Sapphire, 3.1 x 3.1 mm From Tanzania

4.14 carat Red Malaya Garnet, Oval loose Malaya Garnet from Tanzania, Natural Untreated Gems, 7.1 x 5.2 mm

11.97 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 21.3 x 15.5 mm

0.42 carat Emerald Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 4.5 x 4.4 mm

24.15 carat Brown Jasper, Pear loose Jasper from India, Natural Untreated Gem, 30.2 x 20.2 mm

0.64 ct Loose Orange Sapphire, 5.8 x 4.2 mm Oval Cut From Madagascar

0.82 ct Loose Pink Sapphire, 7.5 x 6.9 mm Odd Shaped From Madagascar

5.69 carat Round Almandine Garnet, loose Certified Almandine Garnet from Madagascar, Natural Untreated Gems, 3 mm

4.69 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6 x 4.1 mm

2.06 carat Green Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 16.5 x 4 mm

1.14 carat Orange Hessonite Garnet, Pear Shape loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.9 x 5.7 mm

6.71 carat Pear Rutile Quartz, loose Certified Rutile Quartz from India, Natural Untreated Gem, 15 x 11 mm

15.62 carat Pear Howlite, loose Certified Howlite from the United States, Natural Untreated Gem, 23.8 x 19.5 mm

1.4 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5 x 4.9 mm

1.53 carat Yellow Citrine, Cushion loose Citrine from Brazil, Natural Untreated Gem, 7.4 x 7.2 mm

23.8 ct Loose Cushion Charoite, 18.7 x 18.6 mm From Russia

8.29 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 14.8 mm

1.37 ct Yellow Beryl, 8.1 x 8.1 mm Trillion Cut From Brazil

20.74 ct Square Hematite, 17.5 x 17.1 mm From Brazil

4.75 carat Orange Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gems, 5.9 mm

0.56 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 4.8 mm

1.51 ct Loose Yellow Sapphire, 6.1 x 5.1 mm Oval Cut From Tanzania

5.34 ct Princess Cut Rose Quartz, 10.4 x 10.3 mm From South Africa

20.46 ct Oval Howlite, 25.9 x 18.1 mm From the United States

0.44 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 5.1 x 4.1 mm

0.88 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.2 x 4.1 mm

Gemstone Information

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