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

1.33 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 10.1 x 8.1 mm

1.05 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 9.3 x 6.9 mm

0.84 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gems, 6.1 x 4.1 mm

1.83 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.9 x 6 mm

0.45 ct Loose Orange Sphalerite, 4.5 mm Round Cut From Spain

1.6 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 14.3 x 3.8 mm

0.04 ct Black Diamond, 2.1 mm Diamond Cut From India

1.62 ct Oval Cut Peridot, 8.9 x 6.7 mm From China

17.38 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 25.5 x 16 mm

2.91 ct Oval Prehnite, 6.9 x 6.1 mm From South Africa

35.29 ct Oval Tiger's Eye Matrix, 27 x 19.3 mm From Mexico

4.45 ct Round Labradorite, 8.1 mm From Madagascar

2.72 ct Black Star Sapphire, 8.2 x 6.4 mm Oval Cut From Thailand

6.39 ct Yellow Quartz, 8.6 x 8.5 mm Carved From Brazil

0.65 carat Round Grossularite Garnet, loose Certified Grossularite Garnet from Tanzania, Natural Untreated Gem, 5.2 mm

1.47 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gem, 9 x 6.9 mm

2.01 ct Loose Princess Cut Sapphire, 2.7 x 2.7 mm From Tanzania

0.59 ct Loose Orange Sapphire, 4.8 mm Round Cut From Tanzania

8.84 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.1 mm

2.2 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 9.9 x 5.1 mm

9.39 ct Round Coral, 15 mm From Indonesia

27.82 ct Loose Fancy Charoite, 29.7 x 18.1 mm From Russia

4.61 ct Fancy Quartz With Marcasite, 14.3 x 9.9 mm From Brazil

1.8 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.3 x 6.7 mm

0.52 carat Pink Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 7 x 5 mm

3.97 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 3.8 x 3.8 mm

2.08 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.2 x 6.1 mm

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

2.79 ct Oval Cut Golden Beryl, 9.2 x 6.9 mm From Madagascar

2.15 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 9.1 x 6 mm

2.75 carat White Topaz, Cushion loose Topaz from Brazil, Natural Untreated Gems, 4.6 x 4.6 mm

25.95 carat Pear Checkerboard Labradorite, loose Certified Labradorite from Madagascar, Natural Untreated Gem, 32.9 x 18.2 mm

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