Calibrated 11 x 9 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 11 x 9 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

I bought a small ring green so I may practice my jewelry making.

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Overall Rating -> 10

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Overall Rating -> 10

Love Gem select. great gems for the price. Can't beet them

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Overall Rating -> 10

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Posted By Rock hunter in August, 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, I love your site! Great product visibility, information, etc.

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Fine. All emails answered. Excellent service. Nice discount added for orders. Briefly, a very good experience.

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Posted By B in October, 2023

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Overall Rating -> 10

This is only the second time I have ordered from GemSelect. I am a prolific gemstone collector and I wish I had found this site sooner!

Posted By Beachcomber in September, 2023

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Overall Rating -> 9

Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

Posted By Erick in July, 2023

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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.

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Gemstones A-Z

Buy Octagon Shape 11x9 mm Gems

15.52 ct Druzy Citrine, 22.6 x 11.8 mm From Uruguay

4.17 carat White Topaz, Square loose Topaz from Brazil, Natural Untreated Gems, 4 x 4 mm

1.56 ct Oval Cut Andalusite, 5.1 x 3.1 mm From Brazil

1.05 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 10 x 4.8 mm

5.64 ct Red Andesine Labradorite, 10.3 x 8.3 mm Oval Cut From Congo

0.3 carat Pink Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 5.7 x 4.5 mm

1.17 ct Loose Pink Tourmaline, 7.9 x 5.9 mm Oval Cabochon From Mozambique

1.02 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 5.5 mm

74.72 ct Fancy Jasper, 45.4 x 40.3 mm From Indonesia

16.06 ct Loose Fancy Charoite, 25.9 x 12.7 mm From Russia

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

17.69 ct Fancy Jasper, 34.9 x 14.4 mm From Indonesia

1.37 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 15.9 x 3 mm

1.6 carat Oval Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gem, 7.6 x 6.6 mm

3.34 carat Yellow Citrine, loose Citrine from Brazil, Natural Untreated Gem, 11.5 x 9.3 mm

7.47 ct Oval Quartz Cat's Eye, 12.3 x 10.4 mm From Sri Lanka

2.16 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 9.9 x 5.1 mm

6.23 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 13.8 x 10 mm

11.37 ct Oval Cut Rose Quartz, 14.9 x 13.8 mm From South Africa

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

2.13 ct Yellow Beryl, 8.1 x 6.2 mm Oval Cut From Madagascar

1.29 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7 x 5.1 mm

5.58 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6.8 x 5.1 mm

0.73 ct Loose Orange Sapphire, 6.2 x 4.2 mm Oval Cut From Tanzania

13.63 ct Orange Moonstone, 14.5 mm Round Cut From India

19.87 ct Cushion Jasper, 24 x 20.4 mm From Indonesia

1.84 ct Loose Princess Cut Sapphire, 2.3 x 2.2 mm From Tanzania

13 ct Oval Jasper, 19.9 x 15.1 mm From Indonesia

27.38 ct Loose Green Amazonite, 32.5 x 10.6 mm Pencil Cut From Madagascar

35.98 ct Loose Oval Bloodstone, 36.4 x 25.6 mm From Madagascar

2.17 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 9.2 x 9.1 mm

14.42 ct Pink Morganite, 16.7 x 16.2 mm Trillion Cut From Afghanistan

Gemstone Information

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