Marquise Shape 7 x 3.5 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 7 mm x 3.50 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 7x3.5 mm Gems

2.74 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 6.1 x 4.3 mm

0.65 ct Blue Kyanite, 3.7 mm Round Cut From Nepal

4.01 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6 x 4.1 mm

1.44 ct Loose Yellow Sapphire, 3.1 x 3 mm Princess Cut From Tanzania

39.98 ct Oval Jasper, 35.2 x 25.7 mm From Indonesia

4.43 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14 x 10 mm

0.89 carat Pink Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 9.4 x 4.7 mm

0.57 ct Loose Orange Sapphire, 4.4 x 4.3 mm Cushion Cut From Tanzania

13.85 ct Carved Ruby-Zoisite, 18.2 x 13.2 mm From Tanzania

2.04 carat Orange Hessonite Garnet, Square loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 6.8 x 6.7 mm

9.07 ct Marquise Slice Ruby in Fuchsite, 16.9 x 7.4 mm From Ethiopia

0.65 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 5.1 mm

5.88 ct Asscher Cut Rose Quartz, 9 x 9 mm From South Africa

0.74 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gems, 4 mm

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

0.78 ct Orange Sphalerite, 5.4 mm Round Cut From Spain

4.41 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 14.6 x 10.8 mm

0.88 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.2 x 4.2 mm

1.89 carat Heart Checkerboard Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8 x 7.9 mm

10.88 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 17 x 10.2 mm

28.13 ct Oval Rainbow Moonstone, 26.5 x 14.4 mm From the United States

23.62 ct Carved Rose Tiger's Eye, 15.5 x 15.5 mm From Thailand

7.09 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gems, 11.8 x 9.9 mm

3.14 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 9.2 x 7.2 mm

14.18 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 16.1 mm

1.37 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.1 x 5.1 mm

2.12 ct Round Prehnite, 7.2 mm From South Africa

0.9 ct Oval Cut Peridot, 7.1 x 5 mm From China

15.67 ct Loose Fancy Tiger's Eye Matrix, 22.4 x 14.3 mm From Mexico

14.77 ct Oval Rose Quartz, 16.2 x 12.3 mm From South Africa

1.41 ct Purple Spinel, 6.7 x 5.4 mm Cushion Cut From Tanzania

3.4 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 10.9 x 8.8 mm

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