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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Overall Rating -> 10

Found the stone I wanted which was delivered quickly and met expectations.

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Overall Rating -> 9

The selection and filtering is a little overwhelming, but that's only because there is so much to choose from.

Posted By Kasper in June, 2023

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Overall Rating -> 10

Convenient selection, arrival on time

Posted By Alin in February, 2024

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Overall Rating -> 10

I had a great time searching all the lovely stones. This is my first precious loose stone purchase for my own work. I chose sapphire, and found some lovely briolettes. I wanted 3, but this set of 4 was perfect. Everything was quick and easy, and I'm excited.

Posted By Phoenix in February, 2024

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Overall Rating -> 10

Very pleased with shopping on this site. It's easy to navigate and information about gemstones is very good.

Posted By Kate in December, 2023

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Overall Rating -> 10

I love your selection of gems. My only complaing is I wish I could put in a page number to return to that page.When there are over 60 pages of gems it is hard to return to a page with a gem I am considering.

Posted By Cahall in March, 2024

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Overall Rating -> 10

Wonderful selection of gems to choose from. Have made many purchases and was only slightly disappointed once.

Posted By Teemo in February, 2024

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Overall Rating -> 10

Very large selection of items and we used the stones to have several pieces of jewelry made for us.

Posted By Joe in January, 2024

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Overall Rating -> 10

blessed be the lord blessed be the saved blessed be the work blessed be the traveled i write down my good times in these stones and when times are gray i can still se the sunny days refract in these stones

Posted By Kickbass.2 in May, 2023

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Overall Rating -> 10

Super easy to do business for great products.

Posted By BoBBy in January, 2024

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Overall Rating -> 9

Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

Posted By Erick in July, 2023

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Overall Rating -> 10

Great selection

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Overall Rating -> 10

great. thank you

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Overall Rating -> 10

Extremely easy to use, and I am fully satisfied with the purchase process.

Posted By Fl_Beachcomber in October, 2023

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Gemstones A-Z

Buy Marquise Shape 16x8 mm Gems

7.31 ct Oval Tiger's Eye, 13.7 x 9.8 mm From Thailand

0.21 ct Round Cut Kornerupine, 3.7 mm From Sri Lanka

2.56 carat Sky Blue Topaz, Marquise Cut loose Topaz from Brazil, Natural Gem, 12.1 x 6.1 mm

29.19 ct Carved Ruby-Zoisite, 33.1 x 24.2 mm From Tanzania

3.35 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.2 x 5.1 mm

5.26 carat Sky Blue Topaz, Half Drilled Briolette loose Topaz from Brazil, Natural Gems, 8.2 mm

7.13 carat Half Drilled Briolette Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 13.1 mm

2.32 ct Loose Trillion Cut Amethyst, 9.4 x 9.3 mm From Brazil

5.37 carat Multicolor Mystic Quartz, Pear Concave Cut loose Mystic Quartz from Brazil, Natural Gem, 14.2 x 10.2 mm

6.43 ct Round Rutile Quartz, 9.3 mm From India

0.52 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from the United States, Natural Untreated Gem, 5.1 x 5 mm

3.64 ct Orange Moonstone, 8 x 6 mm Oval Cut From India

10.26 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 14.2 x 10.1 mm

16.32 ct Fancy Jasper, 27 x 13.5 mm From Indonesia

4 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.1 x 4.1 mm

6.32 ct Loose Baguette Tiger's Eye, 12.1 x 10.2 mm From Thailand

3.8 ct Loose Orange Moonstone, 8.1 x 8 mm Trillion Cut From India

5.67 carat Swiss Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 9 x 8.9 mm

1.16 ct Loose Orange Sapphire, 6 x 4.1 mm Oval Cut From Tanzania

3.95 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 3.9 x 3.8 mm

21.7 ct Oval Nuummite, 18.5 x 15.9 mm From India

14.06 ct Yellow Quartz, 16.1 x 16.1 mm Octagon Concave Cut From Brazil

0.3 ct Yellow Sphalerite, 3.6 mm Round Cut From Spain

7.67 carat Cushion Ruby, loose Certified Ruby from Madagascar, Natural Gem, 10.3 x 10.1 mm

0.5 carat Blue Green Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gem, 4.4 mm

5.88 carat Blue Zircon, Oval loose Zircon from Cambodia, Natural Gem, 9.5 x 7.9 mm

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

1.54 ct Yellow Beryl, 9.2 x 7.1 mm Oval Cut From Madagascar

12.47 ct Yellow Quartz, 16.1 x 15.5 mm Carved From Brazil

8.82 carat Pear Shape Mystic Quartz, loose Certified Mystic Quartz from Brazil, Natural Gem, 18.2 x 13.1 mm

0.63 ct Pink Morganite, 6.9 x 4.9 mm Oval Cut From Afghanistan

1.04 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gems, 7.1 x 5.1 mm

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