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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Very large selection of items and we used the stones to have several pieces of jewelry made for us.

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Gemstones A-Z

Buy Square Shape 13x13 mm Gems

3.9 carat Sky Blue Topaz, Round loose Topaz from Brazil, Natural Gems, 8.1 mm

1.22 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 9.9 x 6.8 mm

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

2.82 ct Loose Trillion Cut Amethyst, 10.1 x 9.8 mm From Brazil

1.89 ct Yellow Beryl, 10 x 7.6 mm Oval Cut From Madagascar

1.01 ct Marquise Cut Peridot, 8 x 3.9 mm From China

9.81 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 14.2 x 10.9 mm

2.92 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 9 x 7.2 mm

3.57 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.8 x 8.4 mm

0.86 carat Green Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5 x 5 mm

2.08 ct Green Sphene, 7.9 x 6.9 mm Oval Cut From Sri Lanka

1.01 ct Loose Yellow Sapphire, 4.5 mm Round Cut From Thailand

2.12 ct Pink Kunzite, 7.5 x 5.5 mm Octagon Cut From Afghanistan

4.75 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 6.9 x 7 mm

40.78 ct Round Hematite, 21.8 mm From Brazil

0.6 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 5.1 mm

7.89 carat Sky Blue Topaz, Marquise Cut loose Topaz from Brazil, Natural Gems, 13.9 x 8 mm

9.73 ct White Quartz, 14.1 x 14 mm Asscher Cut From Brazil

3.98 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4 x 4 mm

11.47 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 10 x 8.1 mm

1.17 ct Loose Orange Sapphire, 6.2 x 4.3 mm Oval Cut From Tanzania

12.79 ct Yellow Quartz, 16.1 x 16 mm Octagon Concave Cut From Brazil

0.54 ct Blue Kyanite, 3.8 mm Round Cut From Nepal

3.41 ct Octagon Cut Rose Quartz, 9 x 9 mm From South Africa

1.79 ct Baguette Labradorite, 8.3 x 6.2 mm From Madagascar

2.46 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 9.2 x 7.2 mm

5.65 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14.2 x 10.2 mm

1.9 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 8.1 x 6.2 mm

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

44.82 ct Oval Jasper, 33.9 x 19.4 mm From Indonesia

4.25 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 15.6 x 9.8 mm

0.2 carat Oval Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gem, 4.1 x 3.1 mm

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