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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Gemstone Information

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It was easy to find the color gem I desired and checkout was simple as well. Very excited to receive my gemstone.

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Purchasing from Gem Select was a pleasant and easy experience. The photos of the stones I was interested in were an accurate depiction of the stones I received. Ordering was easy and the items arrived within a week. Over all it was a very positive experience.

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

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Overall Rating -> 7

I placed order#384714 based on the picture on your website and the stone came in much darker. I'm sure it's the same stone i ordered but your lighting made it seem a lighter blue. I was trying to match a stone for a customer and based on the picture it would have been close enough but the stone in person is a mile off.

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Overall Rating -> 10

great. thank you

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Gemstones A-Z

Buy Octagon Shape 27 x 20 mm Gems

0.73 ct Loose Orange Sapphire, 5.2 mm Round Cut From Tanzania

0.99 ct Oval Black Opal, 8.9 x 7.1 mm From Ethiopia

5.97 ct Carved Prehnite, 16.4 x 10.8 mm From South Africa

1.42 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8 x 6 mm

1.59 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 8.7 x 4.9 mm

1.03 ct Blue Kyanite, 6.1 mm Round Cut From Nepal

27.69 ct Yellow Quartz, 18.9 x 18.9 mm Cushion Checkerboard From Brazil

0.38 carat Pear Shape Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.1 x 3.9 mm

10.02 ct Round Maw-Sit-Sit, 12.3 mm From Myanmar

1.6 carat Green Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 13.3 x 4 mm

0.58 carat Orange Spessartite Garnet, Oval loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 5.1 x 4.3 mm

2.19 ct Round Onyx, 5.6 mm From Sri Lanka

0.6 ct Loose Pink Sapphire, 6.4 x 4.4 mm Oval Cut From Madagascar

1.28 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 13.4 x 3.7 mm

13.11 ct Carved Prehnite, 17 x 11.1 mm From South Sea

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

1.06 carat Oval Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gem, 6.9 x 5 mm

14.49 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 14 x 9.8 mm

4.87 carat Pear Dendritic Agate, loose Certified Dendritic Agate from India, Natural Untreated Gem, 14.5 x 10.2 mm

5.96 ct Loose Pink Kunzite, 12.7 x 7.9 mm Octagon Cut From Afghanistan

3.28 ct Orange Moonstone, 7 mm Round Cut From India

6.55 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.2 x 9.1 mm

14.31 ct Fancy Pietersite, 25.5 x 10.1 mm From China

2.07 ct Cushion Cut Peridot, 8.4 x 6.4 mm From Myanmar

12.94 ct Oval Agate, 17.2 x 15.1 mm From Indonesia

5.58 ct Green Jadeite, 16.6 x 9.1 mm Oval Cut From Myanmar

1.48 ct Oval Cut Fire Opal, 9.9 x 7.2 mm From Mexico

71.74 carat Pear Howlite, loose Certified Howlite from the United States, Natural Untreated Gem, 40.8 x 31.7 mm

0.83 carat Oval Peridot, loose Certified Peridot from China, Natural Untreated Gem, 7 x 5 mm

0.81 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 6 x 4.2 mm

3.53 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.3 x 9.1 mm

10.34 ct Asscher Cut Smoky Quartz, 10.4 x 10.3 mm From Brazil

Gemstone Information

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