Calibrated 4 x 4 mm Square Shape Loose Natural Gemstones from GemS...

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 4 mm x 4 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 4x4 mm Gems

9.81 carat Multicolor Jasper, Pear loose Jasper from Indonesia, Natural Untreated Gem, 19.9 x 15.1 mm

4.9 ct Blue Kyanite, 12 x 8.2 mm Oval Cut From Nepal

1.9 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7.1 x 5 mm

1.2 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 6.7 x 5 mm

1.19 ct Loose Oval Cut Black Opal, 9.8 x 7.6 mm From Ethiopia

1.82 carat Heart Cabochon Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.3 x 6 mm

7.77 ct Oval Cut Strawberry Quartz, 11.1 x 9.1 mm From Russia

1.66 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5 x 3.1 mm

2.02 ct Brown Diamond, 6.6 x 6.5 mm Cushion Cut From South Africa

2.03 carat Carved Leaf Ruby, loose Certified Ruby from Madagascar, Natural Gem, 12.3 x 8.8 mm

1.65 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5.1 mm

16.9 ct Oval Jasper, 22.1 x 16.2 mm From Indonesia

12.85 carat Pear Shape Smoky Quartz, loose Certified Smoky Quartz from Brazil, Natural Untreated Gems, 15.1 x 11 mm

14.5 ct Oval Jasper, 20.9 x 14.7 mm From Indonesia

41.78 ct Oval Obsidian, 35.9 x 24.4 mm From the United States

0.83 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 6.8 x 4.9 mm

0.31 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.9 mm

6.74 ct Amethyst Geode Slice, 15.4 x 12.9 mm From Brazil

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

1.17 ct Green Sphene, 6.7 x 5.6 mm Oval Cut From Sri Lanka

5.43 ct Loose Pink Kunzite, 10.9 x 9.1 mm Cushion Cut From Afghanistan

7.05 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16 x 11.8 mm

0.45 carat Blue Sapphire, Trillion-Cut loose Sapphire from Madagascar, Natural Gem, 4.7 x 4.6 mm

18.34 ct Brown Moonstone, 20.1 x 15.2 mm Oval Cut From India

8.75 ct Cushion Tiger's Eye, 14 x 11.8 mm From Thailand

1.07 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 6.2 mm

1.22 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 8 x 5.9 mm

3.68 ct Oval Rutile Quartz, 12.2 x 8.1 mm From India

0.57 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6.1 x 4.1 mm

0.7 carat Pink Sapphire, Pear Shape loose Sapphire from Madagascar, Natural Gem, 6 x 4.9 mm

16.57 ct Loose Pear Dendritic Agate, 18.2 x 13.2 mm From India

2.53 ct Oval Cut Strawberry Quartz, 8.2 x 6.1 mm From Russia

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