Marquise Shape 6 x 3 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 6 mm x 3 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 6x3 mm Gems

23.41 ct Pencil Cut Jasper, 33.7 x 9.7 mm From Indonesia

0.37 ct Round Chrysoberyl Cat's Eye, 3.7 mm From Sri Lanka

0.06 ct Blue Diamond, 2.5 mm Diamond Cut From India

1.49 ct Orange Sunstone, 8.1 x 6.2 mm Oval Cut From India

1.63 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.2 mm

3.06 carat Yellow Andesine Labradorite, Pear loose Andesine Labradorite from Congo, Natural Gem, 9.9 x 7.8 mm

0.56 carat Green Sapphire, Round loose Sapphire from Tanzania, Natural Gem, 4.3 mm

1.83 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 11.8 x 7.9 mm

3.77 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6 x 4.1 mm

22.03 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 23.2 x 16.1 mm

0.57 carat Green Sapphire, Cushion loose Sapphire from Tanzania, Natural Gem, 4.4 x 4.4 mm

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

1.52 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 11.9 x 6 mm

2.26 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 8.9 x 8.8 mm

0.6 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6 x 4.2 mm

6.07 carat Swiss Blue Topaz, Round loose Topaz from Brazil, Natural Gems, 9.2 mm

5.29 ct Yellow Quartz, 11.9 mm Round Concave Cut From Brazil

0.28 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 3.8 mm

2.09 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10.2 x 8.1 mm

2.6 ct Oval Prehnite, 6.6 x 5.2 mm From South Africa

9.8 ct Oval Tiger's Eye, 18.4 x 13.4 mm From India

6.3 ct Yellow Agate, 12.4 x 11.5 mm Oval Cut From India

1.53 carat Oval Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6.9 x 5 mm

3.9 ct Round Cut Peridot, 5.9 mm From China

1.25 carat Yellow Citrine, Cushion Buff Top loose Citrine from Brazil, Natural Untreated Gem, 8.1 x 6.1 mm

2.04 ct Blue Kyanite, 8.1 x 6.2 mm Oval Cut From Nepal

6.48 ct Yellow Quartz, 14.2 x 10 mm Carved From Brazil

5.63 carat Yellow Citrine, Cushion loose Citrine from Brazil, Natural Untreated Gem, 15.7 x 9.1 mm

0.38 ct Loose Yellow Sapphire, 4.6 mm Round Cut From Tanzania

0.31 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 4.9 x 3.9 mm

2.77 carat Purple Tourmaline, Pear Shape loose Tourmaline from Mozambique, Natural Untreated Gem, 10.4 x 7.1 mm

8.87 ct Loose Pear Labradorite, 16.2 x 11.9 mm From Madagascar

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