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

1.58 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 5.9 x 5.7 mm

5.45 ct Orange Sunstone, 14 x 10.1 mm Oval Cut From India

3 ct White Moonstone, 10.9 x 8.3 mm Oval Cut From India

4.03 carat Carved Leaf Ruby, loose Certified Ruby from Madagascar, Natural Gem, 13.7 x 10.1 mm

2.24 carat Cushion Emerald, loose Certified Emerald from Zambia, Natural Gem, 9.2 x 7.2 mm

29.55 carat Swiss Blue Topaz, Cushion loose Topaz from Brazil, Natural Gem, 19 x 15.2 mm

13.2 ct Yellow Quartz, 16.7 x 16.5 mm Carved From Brazil

1.69 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.7 x 5.3 mm

0.66 ct Loose Yellow Sapphire, 4.4 x 4.4 mm Cushion Cut From Tanzania

18.76 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18 x 17.6 mm

0.36 carat Round Cabochon Emerald, loose Certified Emerald from Colombia, Natural Gem, 4.2 mm

6.45 ct Round Rutile Quartz, 12.1 mm From India

0.46 ct Pink Morganite, 6.9 x 4.1 mm Oval Cut From Afghanistan

6.11 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 11 x 8.9 mm

13.68 carat Pear Tiger's Eye, loose Certified Tiger's Eye from Thailand, Natural Untreated Gem, 20.3 x 15.1 mm

24.18 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 27.9 x 17.9 mm

0.05 ct Black Diamond, 2 mm Diamond Cut From India

1.35 carat White Opal, Pear Shape loose Opal from Ethiopia, Natural Untreated Gem, 9 x 6.8 mm

5.94 carat Swiss Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 9.1 x 9 mm

3.51 ct Purple Kunzite, 7.6 x 7.6 mm Octagon Cut From Afghanistan

1.95 carat Swiss Blue Topaz, Fancy-Cut loose Topaz from Brazil, Natural Gems, 7.2 x 5.1 mm

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

27.92 ct Yellow Quartz, 19.7 x 14.8 mm Oval Portuguese Cut From Brazil

21.36 ct Green Jade, 24.7 x 14.6 mm Carved From Myanmar

8.59 carat Carved Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 13.2 x 12.9 mm

3.05 ct Oval Cut Strawberry Quartz, 9 x 6.9 mm From Russia

2.9 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gem, 8.7 x 8.6 mm

16.38 ct Loose Pear Cut Amethyst, 21.2 x 16 mm From Brazil

1.84 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.1 x 7.1 mm

0.92 ct Octagon Cut Peridot, 7 x 5 mm From China

18.05 ct Odd Shaped Druzy Variscite, 26.5 x 17.4 mm From China

2.33 carat Oval Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gems, 5.1 x 3.1 mm

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