Calibrated 8 x 8 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 8 mm x 8 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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I was in the market for birthstones for a lil gift project im doing. I'm no expert in gems or what not but the quality as far as i can tell seems to be spot on.

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I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

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Very excited and impressed with all your products. Keep up the good work....more different stones to choose from. I like Cabachons.

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It was easy to navigate and I hope that the gem is as nice as the picture

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My first order. I am anxious to see if what I ordered is what I receive.

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Gemstones A-Z

Buy Square Shape 8x8 mm Gems

0.6 carat Blue Tanzanite, Round loose Tanzanite from Tanzania, Natural Gem, 5 mm

0.17 ct Black Diamond, 2.5 x 2.4 mm Princess Cut From India

2.21 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 9.7 x 5 mm

2.13 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.1 x 7 mm

1.73 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5 x 3 mm

0.92 ct Marquise Cut Color-Change Diaspore, 10.2 x 4.8 mm From Turkey

71.05 ct Oval Howlite, 37.1 x 26.4 mm From the United States

0.55 ct Loose Yellow Sapphire, 5.8 x 4 mm Oval Cut From Tanzania

4.46 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 7 mm

3.2 ct Round Onyx, 7 mm From Sri Lanka

13.27 ct Octagon Cut Bloodstone, 13.7 x 13.4 mm From Madagascar

23.37 ct Oval Checkerboard Labradorite, 21.9 x 15.8 mm From Madagascar

0.32 ct Oval Cut Kornerupine, 5.2 x 3.8 mm From Sri Lanka

6.07 ct Yellow Quartz, 12.7 x 11.7 mm Octagon Cut From Brazil

3.22 ct Yellow Quartz, 11.1 x 11 mm Carved From Brazil

0.55 carat White Topaz, Oval loose Topaz from Brazil, Natural Untreated Gem, 6.2 x 4.2 mm

1.33 carat Green Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 20.9 x 3 mm

0.54 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 5.9 x 4.1 mm

0.88 ct Yellow Beryl, 7.3 x 3.9 mm Trillion Cut From Madagascar

23.17 ct Loose Pencil Cut Jasper, 38 x 9.6 mm From Indonesia

4.79 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.2 mm

5.64 ct Fancy Fire Agate, 16.7 x 9.8 mm From Mexico

1.47 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.9 x 7.1 mm

0.37 ct Blue Apatite, 3.5 mm Round Cut From Madagascar

1.94 carat Sky Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 4.2 x 4.1 mm

2.13 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 18.6 x 3.8 mm

2.51 ct Orange Agate, 7.8 x 6 mm Oval Cut From India

6.14 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 12.1 mm

2.85 ct Yellow Apatite, 8.5 x 8.4 mm Asscher Cut From Madagascar

6.2 ct Yellow Quartz, 14.9 x 7.9 mm Octagon Cut From Brazil

5.55 ct Oval Black Opal, 9.2 x 7.1 mm From Ethiopia

8.07 ct Oval Star Ruby, 12.2 x 10.7 mm From Madagascar

Gemstone Information

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