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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Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

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Interested in unusual stones and found many that I purchased or will purchase in the near future. I have been a customer of gem select for almost ten years and have always been pleased with buying experience and the delivered product

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Gemstones A-Z

Buy Marquise Shape 16x8 mm Gems

1.79 carat Orange Hessonite Garnet, Square loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.6 x 6.6 mm

2.77 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 9.5 x 6.3 mm

3.53 carat Emerald Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6.1 x 4.1 mm

11.72 ct Round Cut Smoky Quartz, 15.5 mm From Brazil

2.34 ct Round Prehnite, 7.8 mm From South Africa

3.41 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 6.2 x 4.2 mm

0.81 carat Blue Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5.5 x 4.5 mm

2.96 ct Oval Cut Golden Beryl, 11.3 x 9 mm From Madagascar

18.1 carat White Jadeite, Pear loose Jadeite from Myanmar, Natural Untreated Gem, 22.7 x 12.2 mm

7.65 ct Yellow Quartz, 14.1 x 13.9 mm Carved From Brazil

1.58 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.2 x 5.1 mm

3.84 ct Pink Kunzite, 10 x 7.4 mm Cushion Cut From Afghanistan

0.75 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 5.8 x 3.9 mm

0.6 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 4.6 mm

4.75 carat London Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 12 x 8.3 mm

1.21 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 18.9 x 3.4 mm

11.97 ct Trillion Pietersite, 16.8 x 15.9 mm From Namibia

16.9 ct Oval Jasper, 22.1 x 16.2 mm From Indonesia

3.04 ct Yellow Beryl, 9.1 x 7 mm Oval Cut From Brazil

1.18 ct Blue Kyanite, 7.1 x 5.2 mm Oval Cut From Nepal

4.01 carat Black Star Sapphire, Pear loose Star Sapphire from Thailand, Natural Gem, 11 x 7.9 mm

1.16 carat Opal, loose Certified Opal from Ethiopia, Natural Gem, 9.4 x 7.8 mm

6.22 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 12.9 x 9.8 mm

0.65 ct Octagon Cut Color-Change Diaspore, 5.8 x 4.7 mm From Turkey

3.62 ct Oval Malachite, 10 x 7.8 mm From Congo

18.62 ct Oval Jasper, 29.1 x 20.6 mm From Indonesia

6.91 ct White Moonstone, 9.1 mm Round Cut From India

529.63 ct Oval Star Rose Quartz, 50.1 x 43.7 mm From South Africa

5.99 ct Loose Orange Sapphire, 13.3 x 9.1 mm Oval Cut From Thailand

1.94 ct Loose Orange Moonstone, 7.9 x 7.7 mm Trillion Cut From India

1.34 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 10.3 x 7.5 mm

2.87 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 7.2 x 3.6 mm

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