Marquise Shape 20 x 10 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 20 mm x 10 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

Awesome

Posted By Mic in May, 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

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

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

Easy to use,I have spent many hours looking at the site

Posted By Skip in November, 2023

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Overall Rating -> 10

Easy to use website, made it very easy to buy. Will shop here again.

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Overall Rating -> 10

Great site

Posted By Lord of Bananas in November, 2023

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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

It was easy to navigate and I hope that the gem is as nice as the picture

Posted By 1 in April, 2024

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Overall Rating -> 8

I did not realize how small the stone was. I cannot use it for the project I wanted, but I am keeping the stone and tru to use it in something else.

Posted By Mark in March, 2024

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Overall Rating -> 10

The website design is a bit finicky for mobile, but Im sure its most likely just a mobile issue. Amazing selection of products, great prices.

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Overall Rating -> 9

Overall good, shipping prices just seem a little on the high side.

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Overall Rating -> 10

Overall, the whole process was just great.

Posted By Thatoneguy in August, 2023

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Overall Rating -> 10

I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

Posted By Papa in December, 2023

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Overall Rating -> 10

Pleasant.

Posted By Mk in November, 2023

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Gemstones A-Z

Buy Marquise Shape 20x10 mm Gems

1.54 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 9.9 x 4.4 mm

29.18 ct Cushion Cut Nuummite, 24.7 x 14.6 mm From India

1.49 ct Oval Cat's Eye Moonstone, 8.8 x 7.2 mm From India

2.26 carat Blue Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 4.6 mm

2.51 ct White Moonstone, 9.2 x 7.1 mm Oval Cut From India

3.77 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.1 x 9 mm

3.06 carat White Topaz, Cushion loose Topaz from Brazil, Natural Untreated Gems, 4.6 x 4.5 mm

2.76 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gem, 8.9 x 8.9 mm

20.38 carat Pear Shape Onyx, loose Certified Onyx from Sri Lanka, Natural Gem, 24.7 x 18 mm

1.17 ct Blue Kyanite, 7.6 x 5.8 mm Oval Cut From Nepal

10.3 ct Brown Moonstone, 20.1 x 11.1 mm Carved From India

0.74 ct Yellow Sphalerite, 5.2 mm Round Cut From Spain

6.02 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.2 mm

0.78 carat Yellow Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 6.1 x 5 mm

1.73 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.1 mm

21.18 ct Oval Jasper, 24.8 x 20.5 mm From Indonesia

18.43 carat Pear Rhodochrosite, loose Certified Rhodochrosite from South Africa, Natural Untreated Gem, 23.8 x 14.9 mm

5.36 ct Loose Marquise Pietersite, 21 x 8 mm From Namibia

19.12 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 28.7 x 17.2 mm

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

3.4 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.1 x 9 mm

6.91 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.6 x 12.1 mm

8.11 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 13.9 x 8.2 mm

0.54 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.1 x 3.1 mm

18.45 ct Cushion Tiger's Eye, 14.1 x 12 mm From Thailand

2.37 ct Loose Orange Sapphire, 3.7 mm Diamond Cut From Tanzania

1.71 carat Pink Tourmaline, Oval Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 8.7 x 6.9 mm

0.66 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 8 x 4.2 mm

17.46 ct Cushion Jasper, 24 x 17.5 mm From Indonesia

25.72 ct Yellow Spinel, 17.7 x 8.3 mm Baguette Rose Cut From Thailand

25.23 ct Oval Rainbow Moonstone, 19 x 12.2 mm From the United States

3.23 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 9.9 x 7.1 mm

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