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

5.56 ct Round Actinolite Cat's Eye, 11 mm From the United States

2.33 ct Carved Rose Quartz, 13 x 8.2 mm From Brazil

73.18 ct Oval Tiger's Eye Matrix, 33.8 x 24.5 mm From Mexico

41.08 ct Brown Jasper, 26.6 x 22 mm Oval Cut From Indonesia

2.18 ct Loose Yellow Sapphire, 4.5 mm Round Cut From Tanzania

2.38 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.7 mm

0.57 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 4.9 mm

2.49 carat White Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 6.4 mm

1.77 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.2 x 5.2 mm

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

1.44 carat Pear Shape Opal, loose Certified Opal from Australia, Natural Untreated Gem, 12.6 x 7.7 mm

24.55 ct Oval Star Ruby, 17.3 x 14.7 mm From Madagascar

9.51 ct Blue Green Grandidierite, 14.7 x 11.1 mm Oval Cut From Madagascar

62.01 ct Oval Jasper, 31.6 x 25.4 mm From Indonesia

2.76 carat Round Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gems, 2.5 mm

1.82 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gems, 8.1 x 6.1 mm

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

6.8 ct Oval Agate, 13 x 11.2 mm From Indonesia

6.92 ct Oval Cat's Eye Opal, 14.1 x 11.6 mm From Madagascar

4.7 ct Loose Oval Cut Strawberry Quartz, 12.1 x 10.1 mm From India

8.16 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gems, 8.1 x 6.1 mm

13.87 carat Cameo Mother of Pearl, loose Certified Mother of Pearl from China, Natural Gem, 25.1 mm

3.67 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gems, 8.2 x 6.7 mm

25.34 ct Yellow Spinel, 17.6 x 8.2 mm Baguette Rose Cut From Thailand

2.31 carat Swiss Blue Topaz, Trillion-Cut loose Topaz from Brazil, Natural Gems, 7.1 x 7 mm

1.55 carat Heart Checkerboard Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8.2 x 8 mm

14.4 ct Loose Oval Agate, 16.5 x 13.6 mm From Indonesia

1.45 carat Pear Shape Golden Beryl, loose Certified Golden Beryl from Madagascar, Natural Untreated Gem, 10.2 x 7 mm

1.71 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.1 mm

6.38 ct Round Black Opal, 8.2 mm From Ethiopia

1.44 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 7.9 x 6 mm

6.88 ct Carved Prehnite, 17.3 x 11.6 mm From South Africa

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