Marquise Shape 16 x 8 mm calibrated natural loose gems from GemSelect

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 marquise shaped facet cut gems, gemstone carvings and cabochons available in 16 mm x 8 mm sizes. For the largest selection of colored gemstones, Shop GemSelect Online.

As a general guideline, when it comes to calibrated gems, they are not usually expected to be cut to exact measurements and specifications. But rather, they're cut with slight variance in size, though the close approximatation in size is not clearly defined, there are general guidelines for what is considered acceptable. Obviously larger and heavy carat weight stones allow more room in size for variance, while smaller stones may leave little to none. This means a large 30mm calibrated gemstone, could actually be closer to 31 millimeters. For this reason, we recommend to always view the exact size in addition to the calibrated size details. The exact size will inform you of the variance you can expect. Some setting styles are more flexible with variance, such as prong settings, while other styles of mountings may need almost an exact size to the fraction of millimeter.

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 round shape settings will allow 0.3 mm or slightly higher even. This small variance can usually be accommodated for most 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 Marquise Shape 16x8 mm Gems

2.44 carat Green Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 18.5 x 4.3 mm

30.42 ct Fancy Obsidian, 28.2 x 21.8 mm From Mexico

33.73 ct Fancy Boulder Opal, 35.2 x 23.5 mm From Australia

4.69 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 13.3 x 10.3 mm

0.74 carat Yellow Citrine, Heart loose Citrine from Brazil, Natural Untreated Gem, 6.2 x 6 mm

27.14 ct Multicolor Fossil Coral, 21.3 x 11.5 mm Odd Shaped From Indonesia

1.52 ct Blue Apatite, 5 x 4.1 mm Oval Cut From Madagascar

3.16 carat White Opal, Oval loose Opal from Australia, Natural Untreated Gems, 10.4 x 8 mm

6.6 carat Round Opal, loose Certified Opal from Australia, Natural Untreated Gem, 12.5 mm

0.24 carat Oval Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gem, 5.1 x 3.1 mm

3.61 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 10.9 x 7 mm

3.86 carat Pear Shape Mystic Quartz, loose Certified Mystic Quartz from Brazil, Natural Gems, 10.2 x 7.1 mm

77.71 ct Baguette Jasper, 35.3 x 23.3 mm From Indonesia

2.31 ct Yellow Quartz, 9.3 x 9.3 mm Carved From Brazil

9.03 ct Octagon Cut Smoky Quartz, 12.8 x 12.6 mm From Brazil

1.58 ct Multicolor Mystic Quartz, 8 mm Round Concave Cut From Brazil

15.75 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 26.3 x 17.8 mm

1.43 ct Yellow Beryl, 6.9 x 5 mm Oval Cut From Madagascar

0.59 carat Green Sapphire, Cushion loose Sapphire from Tanzania, Natural Gem, 4.3 x 4.3 mm

3.36 carat Green Tourmaline, Pear Shape loose Tourmaline from Mozambique, Natural Untreated Gem, 10 x 8 mm

26.17 ct Pink Smithsonite, 14.9 x 14.7 mm Cushion Cut From Mexico

10.64 ct Baguette Ruby-Zoisite, 12.1 x 11.3 mm From Tanzania

4.88 ct Round Concave Cut Mystic Quartz, 12.1 mm From Brazil

12.61 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.9 x 14.9 mm

8.25 ct Round Rutile Quartz, 14.1 mm From India

2.39 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.5 x 3.9 mm

0.38 ct Loose Yellow Sapphire, 4.3 x 4.2 mm Heart Cut From Tanzania

0.55 ct Loose Purple Sapphire, 6.1 x 4.2 mm Oval Cut From Madagascar

14.69 ct Carved Ruby-Zoisite, 15.6 x 14.4 mm From Tanzania

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

2.27 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 9.2 x 9.1 mm

2.08 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.1 mm

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