Calibrated 8 x 6 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 8 x 6 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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The site was easy to shop and the payment was secure. I’m looking forward to receiving my order!

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Overall Rating -> 10

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Overall Rating -> 10

I am excited for my first order, search tools were a great help to find the sapphire I needed for my next project! Thank you

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Overall Rating -> 10

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The website is very easy to use. The search function, filter and sort functions are very helpful.

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My first order. I am anxious to see if what I ordered is what I receive.

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Very Good

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Always have good experience

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Overall Rating -> 9

I was in the market for birthstones for a lil gift project im doing. I'm no expert in gems or what not but the quality as far as i can tell seems to be spot on.

Posted By PixelComposer in January, 2024

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Overall Rating -> 9

Easy to use. Limited supply of higher quality gemstones.

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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.

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Overall Rating -> 9

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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

I have used gm select a while ago and was always pleased with the products

Posted By Jaytee in November, 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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Gemstones A-Z

Buy Octagon Shape 8x6 mm Gems

26.75 carat Pear Lepidolite, loose Certified Lepidolite from the United States, Natural Untreated Gem, 30.9 x 18.9 mm

1.43 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.9 x 4.9 mm

10.85 carat Pear Black Opal, loose Certified Black Opal from Ethiopia, Natural Gem, 28.2 x 9.5 mm

6.75 ct Loose Pear Dendritic Agate, 18.1 x 13.2 mm From India

7.92 ct Oval Strawberry Quartz, 15.7 x 11.7 mm From Russia

3.7 carat Blue Sapphire, Princess-Cut loose Sapphire from Madagascar, Natural Gems, 2.9 x 2.9 mm

0.6 carat Blue Tanzanite, Pear Shape loose Tanzanite from Tanzania, Natural Gems, 5 x 3.8 mm

2.57 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.1 mm

0.76 ct Loose Purple Sapphire, 6.2 x 5.1 mm Oval Cut From Tanzania

0.83 carat Pear Shape Peridot, loose Certified Peridot from China, Natural Untreated Gem, 7 x 5.1 mm

19.45 ct Oval Rainbow Moonstone, 23.8 x 12.8 mm From the United States

9.7 carat Pear Coral, loose Certified Coral from Indonesia, Natural Untreated Gems, 16.1 x 10.4 mm

9.72 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 21.1 x 6.9 mm

2.6 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10.2 x 5.2 mm

1.73 ct Pink Morganite, 9 x 6.9 mm Oval Cut From Afghanistan

9.58 ct Carved Rose Quartz, 22 x 14.1 mm From Brazil

49.39 ct Green Jade, 37.9 x 25.2 mm Carved From Myanmar

13.17 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 22.7 x 11.9 mm

4.74 carat Pear Pietersite, loose Certified Pietersite from Namibia, Natural Untreated Gems, 17.9 x 8.4 mm

3.01 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.2 x 5.1 mm

0.78 ct Octagon Cut Peridot, 7 x 5 mm From China

0.86 carat Oval Peridot, loose Certified Peridot from China, Natural Untreated Gem, 7.1 x 5.1 mm

4.15 ct Round Pietersite, 9.8 mm From Namibia

9.3 ct Asscher Cut Rose Quartz, 12 x 11.9 mm From South Africa

2.15 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 9.2 x 9.1 mm

25.5 ct Loose Oval Ruby-Zoisite, 19.9 x 14.7 mm From Tanzania

16.43 ct Oval Onyx, 21.9 x 18.7 mm From Sri Lanka

0.12 carat Baguette Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 2.7 x 2.5 mm

0.83 ct Violet Spinel, 7.1 x 4.9 mm Cushion Cut From Tanzania

0.88 ct Loose Yellow Sapphire, 6.9 x 4.9 mm Oval Cut From Madagascar

1.19 ct Loose Purple Sapphire, 6.4 x 5.6 mm Cushion Cut From Tanzania

26.43 ct Loose Brown Jasper, 37.3 x 9.6 mm Pencil Cut From Indonesia

Gemstone Information

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