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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was just windowshopping and spotted a couple "Very Uncommons", a tsavorite & a demantoid garnet that were both in a size I was looking for, & that I could very easily pay for -- so figured I would grab the tsavo ASAP and got the demantoid to accompany so they wouldn't be lonely.

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I am of the opinion that the company gem select cares about the product beautiful gems it sells and the cost of the gem I purchased was small i was treated as if it cost a lot of money and product was described in detail and i felt good about the little stones i had ordered.

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Gemstones A-Z

Buy Marquise Shape 16x8 mm Gems

6.87 ct Marquise Pietersite, 28.9 x 8.8 mm From Namibia

2.55 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5 x 3.7 mm

19.06 ct Oval Jasper, 23.7 x 16.7 mm From Indonesia

0.94 ct Loose Orange Hessonite Garnet, 6.6 x 5.4 mm Oval Cut From Madagascar

2.44 ct Oval Sillimanite Cat's Eye, 7.7 x 5.2 mm From Madagascar

4.51 carat Yellow Citrine, Heart loose Citrine from Brazil, Natural Untreated Gems, 6.8 x 6.6 mm

1.33 carat Purple Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Untreated Gem, 7.2 x 5.7 mm

15.16 ct Baguette Seraphinite, 14.1 x 10.1 mm From Russia

1.47 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 11.3 x 7.8 mm

3.28 carat Green Fluorite, Marquise Cut loose Fluorite from India, Natural Untreated Gem, 13.8 x 6.9 mm

0.67 carat Blue Sapphire, Oval loose Sapphire from Sri Lanka, Natural Gem, 7 x 5 mm

45.06 ct Green Aventurine, 24.5 mm Round Cut From Brazil

4.12 carat White Topaz, Square loose Topaz from Brazil, Natural Untreated Gems, 4.1 x 4.1 mm

1 ct Loose Yellow Sapphire, 4.1 x 4.1 mm Cushion Cut From Tanzania

1.73 ct Loose Orange Moonstone, 8 x 7.8 mm Trillion Cut From India

0.53 ct Loose Yellow Sapphire, 4.5 x 4.5 mm Cushion Cut From Tanzania

4.87 ct Loose Orange Moonstone, 9.3 x 6.4 mm Cushion Cut From India

13.61 ct Orange Moonstone, 14.1 mm Round Cut From India

27.47 ct Oval Obsidian, 30.5 x 21 mm From the United States

7.04 ct Round Rutile Quartz, 13.1 mm From India

4.9 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 13.7 x 10.4 mm

17.73 ct Green Amazonite, 10.2 mm Round Cut From Madagascar

3.61 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 10.1 x 8 mm

56.12 ct Baguette Hematite, 19.7 x 14.6 mm From Brazil

0.23 ct White Diamond, 3.1 mm Diamond Cut From India

2.08 ct Loose Pink Tourmaline, 8.9 x 6.9 mm Oval Cabochon From Mozambique

11.03 ct Carved Prehnite, 16 x 10.3 mm From South Africa

2.54 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.6 mm

28.98 carat Bi-color Ametrine, Pear Shape loose Ametrine from Brazil, Natural Untreated Gem, 25.6 x 14.6 mm

11.21 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gem, 22.8 x 12.7 mm

6.66 ct Pink Morganite, 13.1 x 12.6 mm Trillion Cut From Afghanistan

41.67 ct Pencil Cut Jasper, 39.6 x 11.7 mm From Indonesia

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