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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Overall Rating -> 10

great. thank you

Posted By Carrotroller in July, 2023

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Overall Rating -> 10

Very excited and impressed with all your products. Keep up the good work....more different stones to choose from. I like Cabachons.

Posted By Meow in June, 2023

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Overall Rating -> 10

Excellent experience!

Posted By Steph in April, 2023

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Overall Rating -> 10

Very good customer service. I had an issue on my end with shipping and I received a response the next day!

Posted By Orphanboy in December, 2023

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Overall Rating -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 2023

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Overall Rating -> 10

Awesome

Posted By Mic in May, 2023

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Overall Rating -> 9

Well presented images, clear information, quick and easy check out.

Posted By Mr. Bezel in July, 2023

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Overall Rating -> 10

Easy to find products I want. I've ordered several times from gem select and never any problems. Will order again. Thank you.

Posted By Ray in January, 2024

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Overall Rating -> 10

My only complaint is that there are so many beautiful and affordable stones that I get distracted from what I planned to order.

Posted By Phoenix in March, 2024

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Overall Rating -> 10

I found it to be easy to browse and easy to use

Posted By Kyle in December, 2023

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Overall Rating -> 10

The site is very easy to use and I will continue to shop here. The quality is superb

Posted By Genia in January, 2024

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Overall Rating -> 10

The website is easy to navigate and the images are incredible.

Posted By Lindsy in October, 2023

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Overall Rating -> 10

The gems were as described, which is kind of rare these days. I am happy with the purchase, and delevery on time.

Posted By T-bone in October, 2023

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Overall Rating -> 10

i love this site, the gems are always of good quality, i've been buy gifts from the site for 10 years, love it

Posted By Jf in January, 2024

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Overall Rating -> 10

I have actually done business with them before and was quite satisfied with them then.My Mother collected turtle items and when I saw the Mother of Pearl turtle...I just thought of her and decided to buy it. It's even tinier than I thought, but so adorable!The gemstones I bought are for jewelry for my daughter's birthday.

Posted By Ktreva52 in February, 2024

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Gemstones A-Z

Buy Marquise Shape 6x3 mm Gems

23.8 ct Loose Cushion Charoite, 18.7 x 18.6 mm From Russia

2.13 ct Cushion Cut Peridot, 8 x 7.1 mm From Myanmar

210.16 carat Pear Dendritic Agate, loose Certified Dendritic Agate from India, Natural Untreated Gem, 67.3 x 61.5 mm

1.58 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.6 x 6.9 mm

4.74 ct Round Rutile Quartz, 11.2 mm From India

6.35 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 15.7 x 12.5 mm

0.71 carat Bi-color Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 4.8 x 4.8 mm

55.41 ct Round Labradorite, 25.3 mm From Madagascar

18.14 ct Oval Jasper, 29.2 x 21.2 mm From Indonesia

4.65 ct Loose Purple Sapphire, 2.5 x 2.5 mm Princess Cut From Madagascar

7.55 ct Asscher Cut Rose Quartz, 11.9 x 11.7 mm From South Africa

1.1 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.5 mm

4.09 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12.1 x 6 mm

0.67 ct Loose Orange Sapphire, 4.5 x 4.4 mm Cushion Cut From Tanzania

1.58 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5 x 3.1 mm

35.36 ct Oval Idocrase, 35 x 25.4 mm From the United States

0.61 ct Loose Orange Sapphire, 5.8 x 4 mm Oval Cut From Tanzania

0.49 ct Loose Pink Sapphire, 5.1 x 4.2 mm Oval Cut From Madagascar

0.58 ct Loose Purple Sapphire, 6.1 x 4.2 mm Oval Cut From Tanzania

1.95 ct Blue Star Sapphire, 8 x 6 mm Oval Cut From Thailand

9.34 ct Oval Coral, 16.4 x 14.8 mm From Indonesia

7.25 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 14 x 10.1 mm

2.34 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8.3 x 6.7 mm

9.14 ct Oval Cut Strawberry Quartz, 12.2 x 10.2 mm From Russia

5.17 ct White Quartz, 11.3 mm Diamond Cut From Brazil

27.08 ct Cushion Obsidian, 31.7 x 21.7 mm From India

0.26 ct Oval Cut Kornerupine, 3.6 x 2.7 mm From Sri Lanka

3.97 ct Marquise Rutile Quartz, 14.1 x 7.1 mm From India

2.86 ct Oval Sillimanite Cat's Eye, 7.9 x 5.2 mm From Madagascar

2.15 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 6.1 x 4 mm

0.48 ct Square Cut Color-Change Diaspore, 4.7 x 4.7 mm From Turkey

7.29 ct Oval Star Moonstone, 14.1 x 10.8 mm From India

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