Marquise Shape 18 x 9 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 18 mm x 9 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 18x9 mm Gems

0.62 ct Blue Green Apatite, 5.8 x 4.3 mm Oval Cut From Madagascar

0.7 ct Square Cut Color-Change Diaspore, 5.2 x 5.1 mm From Turkey

91.49 ct Odd Shaped Druzy Citrine, 42.7 x 25.7 mm From Uruguay

0.88 ct Round Strawberry Quartz, 5.1 mm From Russia

3.25 ct Square Cut Rainbow Moonstone, 2.9 x 2.8 mm From India

1.42 carat Sky Blue Topaz, loose Topaz from Brazil, Natural Gem, 9.8 x 5 mm

4.35 carat Yellow Citrine, loose Citrine from Brazil, Natural Untreated Gem, 12.3 x 10.4 mm

0.85 carat Yellow Citrine, Heart loose Citrine from Brazil, Natural Untreated Gem, 6.3 x 6.3 mm

11.53 carat Pear Checkerboard Labradorite, loose Certified Labradorite from Madagascar, Natural Untreated Gem, 21.9 x 14.7 mm

9.44 ct Baguette Maw-Sit-Sit, 12.3 x 11.5 mm From Myanmar

4.79 carat Pear Larimar, loose Certified Larimar from the Dominican Republic, Natural Untreated Gem, 19.1 x 12.4 mm

0.74 ct Purple Spinel, 5.5 x 4.9 mm Cushion Cut From Tanzania

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

27.8 ct Oval Ruby-Zoisite, 23.7 x 19 mm From Tanzania

2.37 ct Loose Yellow Sapphire, 4.8 mm Round Cut From Tanzania

2.18 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.2 x 7.1 mm

0.56 ct Orange Sphalerite, 5.2 x 4.4 mm Oval Cut From Spain

56.03 ct Oval Jasper, 42 x 25.4 mm From Indonesia

0.56 ct Loose Yellow Sapphire, 6 x 5 mm Oval Cut From Tanzania

21 ct Green Amazonite, 10.3 mm Round Cut From Madagascar

1.35 carat Pear Shape Rainbow Moonstone, loose Certified Rainbow Moonstone from India, Natural Untreated Gems, 5 x 5 mm

19.81 ct Green Agate, 20.5 mm Round Cut From India

1.19 ct Oval Sillimanite Cat's Eye, 6.9 x 4.7 mm From Madagascar

0.07 ct Black Diamond, 2.5 mm Diamond Cut From India

1.31 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.8 x 4.9 mm

0.91 ct Oval Cut Peridot, 7.2 x 5.1 mm From China

7.99 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 14.1 x 11 mm

6.9 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 22.7 x 5.9 mm

11.17 ct Oval Serpentine, 17.7 x 12.9 mm From the United States

7.26 ct Black Spinel, 9.3 mm Round Rose Cut From Thailand

3.68 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.1 x 9.1 mm

1.98 carat Orange Zircon, Oval loose Zircon from Tanzania, Natural Untreated Gem, 8.1 x 6.1 mm

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