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

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 -> 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

this was very easy im exited to get my order

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Overall Rating -> 10

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

Posted By Sboro in August, 2023

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Overall Rating -> 9

It was simple and clear to understand.

Posted By Thora007 in December, 2023

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Overall Rating -> 10

Easy to find the stones I was looking for. Always good quality stones

Posted By Erin in June, 2023

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Overall Rating -> 10

Purchased for my granddaughter she was very pleased with it.

Posted By Charlie in April, 2024

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Excellent experience!

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Never bought anything on this website before, but it probably won't be my last purchase. Definitely one of the easiest to use and most informative sites I've ever been to.

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Overall Rating -> 10

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Posted By GABY in March, 2024

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Overall Rating -> 9

Everything was good but since I am still new I was surprised at how small the stones where.

Posted By Js in May, 2023

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Overall Rating -> 10

Very Good

Posted By Julian in July, 2023

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Overall Rating -> 10

Todo muy bien en la compra ahora esperar recibir el pedido.

Posted By MAGSMX in August, 2023

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Overall Rating -> 10

love yall

Posted By Rock hunter in August, 2023

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Gemstones A-Z

Buy Octagon Shape 10x8 mm Gems

1.73 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 5.2 x 4.1 mm

1.58 carat Pink Tourmaline, Round Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 7.1 mm

9.93 ct Pink Morganite, 14.8 x 11 mm Oval Cut From Afghanistan

3.2 ct Blue Kyanite, 8.1 x 6.2 mm Oval Cut From Nepal

0.4 carat Blue Kyanite, Round loose Kyanite from Nepal, Natural Untreated Gem, 4.3 mm

1.92 carat Pear Tiger's Eye, loose Certified Tiger's Eye from Thailand, Natural Untreated Gem, 8.2 x 7.8 mm

6.68 ct Oval Cut Strawberry Quartz, 14.1 x 10.1 mm From Russia

4.21 ct Yellow Quartz, 10.3 x 10.2 mm Carved From Brazil

0.77 ct Loose Pink Sapphire, 5 x 4 mm Oval Cut From Madagascar

23.89 ct Green Agate, 20.3 mm Round Cut From India

5.94 carat Swiss Blue Topaz, Heart loose Topaz from Brazil, Natural Gems, 9.1 x 9 mm

35.83 ct Oval Jasper, 37.4 x 26.3 mm From Indonesia

2.31 ct Blue Kyanite, 10.7 x 7 mm Oval Cut From Nepal

10.01 ct Oval Rutile Quartz, 19.6 x 13.1 mm From India

9.51 ct Black Spinel, 10.1 mm Round Rose Cut From Thailand

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

24.05 ct Oval Jasper, 28.8 x 18.7 mm From Indonesia

1.62 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.1 x 5 mm

6.5 ct Loose Oval Lapis Lazuli, 14.2 x 10.2 mm From Afghanistan

5.66 ct Round Concave Cut Rose Quartz, 12.1 mm From Brazil

3.67 ct Oval Malachite, 13.7 x 9.9 mm From Congo

3.24 ct Green Sphene, 8.6 mm Round Cut From Sri Lanka

1.6 carat Brown Hessonite Garnet, Oval loose Hessonite Garnet from Sri Lanka, Natural Untreated Gem, 8.1 x 6.1 mm

4.06 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7.1 x 5.1 mm

2.3 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 10.2 x 5 mm

0.48 carat Green Sapphire, Emerald-Cut loose Sapphire from Tanzania, Natural Gem, 5.2 x 3.3 mm

0.26 ct Black Diamond, 3 mm Diamond Cut From India

4.22 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7 x 5 mm

30.87 ct Pencil Cut Strawberry Quartz, 34 x 11 mm From Russia

2.51 carat Sky Blue Topaz, Trillion loose Topaz from Brazil, Natural Gems, 7 x 7.2 mm

2.29 ct Round Checkerboard Smoky Quartz, 9.1 mm From Brazil

2.69 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.1 x 4 mm

Gemstone Information

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Gemstone EDUCATION

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