Calibrated 27 x 20 mm Octagon Shape Natural Gemstones: 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 Octagon Shape / Emerald-Cut, faceted and cabochon gems available now in 27 x 20 mm size range. Shop a wide range of calibrated gemstones by size online at wholesale from GemSelect.

As a general guideline, when it comes to 'calibrated' gems, they are not usually expected to be cut to exact measurements. 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 -> 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

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

Posted By Lindsy in October, 2023

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Overall Rating -> 10

I have used Gem Select many times over the past 10 years and have always been happy with the product & services

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Overall Rating -> 10

Website was incredibly easy and fast to use. Navigation and product outlay was simple and enjoyable to browse. Thank you and have a blessed day!

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Overall Rating -> 8

I am currently pleased. I like the layout of the website.

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Overall Rating -> 10

love yall

Posted By Rock hunter in August, 2023

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Overall Rating -> 10

The gem stone always has a great selection of beautiful stones. The calibrated stone fit my ring perfectly. Thank you gem select !

Posted By Jen in August, 2023

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Overall Rating -> 10

Everything fine.

Posted By Hilario in December, 2023

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Overall Rating -> 10

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.

Posted By Kittypie070 in April, 2024

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Overall Rating -> 10

Great selection

Posted By GHS40 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 -> 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 -> 9

An it was good.

Posted By Miguel in June, 2023

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Overall Rating -> 10

Excellent experience!

Posted By Steph in April, 2023

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Gemstones A-Z

Buy Octagon Shape 27 x 20 mm Gems

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

0.36 ct Blue Apatite, 3.5 mm Round Cut From Madagascar

20.82 ct Oval Tiger's Eye Matrix, 21.6 x 14.8 mm From Mexico

2.49 ct Cushion Cut Peridot, 9.6 x 7 mm From Myanmar

8.41 ct Octagon Cut Smoky Quartz, 12.4 x 12.4 mm From Brazil

19.86 ct Oval Agate, 15 x 14.3 mm From Indonesia

0.87 ct Oval Cut Peridot, 7.1 x 5.1 mm From China

2.08 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 7 x 6.9 mm

24.75 ct Brown Moonstone, 20 x 15 mm Oval Cut From India

3.74 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 12.1 x 10.1 mm

2.78 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 x 9.7 mm

2.32 carat Sky Blue Topaz, Half Drilled Briolette loose Topaz from Brazil, Natural Gem, 7.3 mm

9.07 carat Pear Dendritic Agate, loose Certified Dendritic Agate from India, Natural Untreated Gem, 19.9 x 14 mm

6.92 ct Oval Actinolite Cat's Eye, 13.5 x 10.4 mm From the United States

19.29 ct Yellow Jadeite, 23.5 x 15.3 mm Oval Cut From Myanmar

0.18 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.6 mm

1.36 ct Brown Diamond, 5.9 x 5.5 mm Octagon Cut From South Africa

5.03 ct Loose Pink Kunzite, 9.8 x 8.5 mm Cushion Cut From Afghanistan

0.39 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 5.8 x 4 mm

23.4 ct Green Jadeite, 24.2 x 19.1 mm Oval Cut From Myanmar

0.7 ct Oval Cut Peridot, 7 x 4.9 mm From China

5.89 carat Oval Star Garnet, loose Certified Star Garnet from India, Natural Untreated Gem, 12.4 x 7.5 mm

0.65 ct Blue Kyanite, 3.7 mm Round Cut From Nepal

26.45 ct Oval Rainbow Moonstone, 29 x 16.2 mm From the United States

5.64 ct Fancy Fire Agate, 17.9 x 8.8 mm From Mexico

1.22 carat Oval Ruby, loose Certified Ruby from Myanmar, Natural Gem, 7 x 5.4 mm

0.73 ct Yellow Beryl, 7.1 x 5.2 mm Oval Cut From Madagascar

5.13 carat Blue Zircon, Oval loose Zircon from Cambodia, Natural Gem, 9.1 x 7.7 mm

5.15 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14 x 9.9 mm

22.75 ct Yellow Quartz, 18.6 x 14.9 mm Oval Checkerboard From Brazil

24.09 ct Oval Moss Agate, 25.8 x 13.6 mm From India

0.6 ct Yellow Sphalerite, 4.8 mm Round Cut From Spain

Gemstone Information

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