Calibrated 10 x 8 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 10 x 8 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

Everything was fine.

Posted By Matt in March, 2024

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Overall Rating -> 9

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

Posted By Steve in August, 2023

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Overall Rating -> 10

Selection ability was straightforward and easy.

Posted By Dave in May, 2023

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Overall Rating -> 10

I purchase all of my stones from GemSelect! They're the best I've found for both selection and value.

Posted By Terry in June, 2023

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Overall Rating -> 10

Had a problem ordering first time. Someone from Gem Select reached out to me and cleared problem and I made purchase.

Posted By Myrtle in February, 2024

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Overall Rating -> 10

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023

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Overall Rating -> 10

Excellent site.

Posted By Boru in December, 2023

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Overall Rating -> 10

Great selection, I love your site! Great product visibility, information, etc.

Posted By John in February, 2024

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Overall Rating -> 10

Very easy. I have purchased a few times before and was satisfied each time. Thank you.

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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 find the website user friendly.

Posted By Becky in August, 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

The website is easy to navigate and has a great selection. I am an amateur silver smith casting jewelry with stones

Posted By Jrplunk in April, 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 -> 7

I feel pretty good so far, pending the delivery of the item ordered.

Posted By Steve in November, 2023

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Gemstones A-Z

Buy Octagon Shape 10x8 mm Gems

5.04 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.5 x 10.2 mm

1.6 carat Yellow Citrine, Baguette Cut loose Citrine from Brazil, Natural Untreated Gem, 9.8 x 5.3 mm

2.34 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10 x 5 mm

4.68 ct Pink Morganite, 11.8 x 9.9 mm Oval Cut From Afghanistan

1.47 ct Pink Morganite, 7.5 mm Round Cut From Afghanistan

1.98 ct Yellow Sillimanite, 6.9 x 5 mm Oval Cut From Sri Lanka

1.38 ct Oval Cut Peridot, 8.2 x 6.2 mm From China

0.16 carat Round Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.5 mm

1.24 ct Pink Morganite, 7.3 mm Round Cut From Afghanistan

4.65 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 13.6 x 9.1 mm

2.68 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 9.8 x 8.1 mm

1.72 ct Oval Cut Peridot, 7.1 x 5 mm From China

2.62 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 6.9 x 6.9 mm

1.12 ct Loose Orange Moonstone, 9.7 x 5.1 mm Marquise Cut From India

4.44 ct Diamond Cut Andalusite, 3.5 mm From Brazil

1.17 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 13.3 x 3.6 mm

1.28 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 10.1 x 5.1 mm

2.62 carat Round Rhodolite Garnet, loose Certified Rhodolite Garnet from Tanzania, Natural Untreated Gems, 4.6 mm

7.75 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 14.8 x 6.8 mm

1.18 carat Orange Hessonite Garnet, Pear Shape loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.8 x 5.9 mm

0.27 carat Emerald Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.6 x 3.5 mm

18.05 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gems, 23.1 x 13.8 mm

3.99 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7 x 5 mm

1.16 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gem, 9.1 x 7.1 mm

1.83 ct Loose Orange Moonstone, 7.9 x 7.8 mm Trillion Cut From India

0.57 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 6.2 x 4.2 mm

2.21 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gems, 7.1 x 5.1 mm

1.84 carat Briolette with Hole Sapphire, loose Certified Sapphire from Madagascar, Natural Gems, 5.2 mm

15.61 ct Marquise Bloodstone, 26.5 x 10.7 mm From Madagascar

2.69 ct Yellow Beryl, 11.2 x 8.7 mm Oval Cut From Brazil

2.91 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.1 x 4.1 mm

30.1 ct Loose Round Labradorite, 25.2 mm From Madagascar

Gemstone Information

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