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

1.97 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 14.5 x 4.3 mm

7.28 ct Yellow Agate, 13.7 x 12.4 mm Oval Cut From India

1.97 ct Oval Cut Andalusite, 5 x 3.2 mm From Brazil

6.9 ct Round Cut Strawberry Quartz, 13 mm From Russia

0.93 ct Oval Sillimanite Cat's Eye, 5.8 x 5.7 mm From Madagascar

0.99 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 5.9 x 4 mm

2.63 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gem, 8.5 x 7 mm

0.76 carat Oval Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gem, 5.9 x 5.2 mm

38.86 ct Oval Jasper, 31.9 x 15.5 mm From Indonesia

1.75 carat Oval Peridot, loose Certified Peridot from China, Natural Untreated Gems, 7.1 x 5.1 mm

1.86 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7 x 6.9 mm

1.02 carat Pear Shape Chrysoberyl, loose Certified Chrysoberyl from Sri Lanka, Natural Untreated Gem, 7.4 x 5.2 mm

0.53 ct Loose Yellow Sapphire, 6 x 5.2 mm Oval Cut From Tanzania

2.71 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5 mm

0.55 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 4.9 mm

2.16 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7.9 x 6.1 mm

5.8 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14.2 x 10 mm

0.43 ct Oval Cut Kornerupine, 5 x 4.1 mm From Sri Lanka

22.57 ct Oval Fossil Coral, 18 x 12.5 mm From Indonesia

4.31 carat Sky Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 4 x 3.9 mm

2.81 ct Oval Strawberry Quartz, 9.1 x 7.2 mm From Russia

8.8 ct Yellow Quartz, 19.2 x 8.2 mm Octagon Cut From Brazil

0.5 ct Loose Orange Sapphire, 4.4 mm Round Cut From Tanzania

0.51 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gem, 4.9 x 4.1 mm

0.54 ct Loose Yellow Sapphire, 3.4 x 3.4 mm Princess Cut From Tanzania

1.36 carat Orange Zircon, Pear Shape loose Zircon from Tanzania, Natural Untreated Gem, 7 x 5.9 mm

3.35 ct Green Agate, 10.1 x 9.4 mm Oval Cut From India

4.83 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 11.4 x 7.4 mm

18.93 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gem, 28.2 x 18.1 mm

0.69 ct Loose Yellow Sapphire, 3.6 x 3.5 mm Princess Cut From Tanzania

18.22 ct Oval Bloodstone, 18 x 13.9 mm From Madagascar

4.87 ct Cushion Onyx, 11 x 10.9 mm From Sri Lanka

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