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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Gemstone Information

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Overall Rating -> 10

i love this site, the gems are always of good quality, i've been buy gifts from the site for 10 years, love it

Posted By Jf in January, 2024

Source: Bizrate

Overall Rating -> 10

My only complaint is that there are so many beautiful and affordable stones that I get distracted from what I planned to order.

Posted By Phoenix in March, 2024

Source: Bizrate

Overall Rating -> 10

I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

Posted By Papa in December, 2023

Source: Bizrate

Overall Rating -> 10

Purchased for my granddaughter she was very pleased with it.

Posted By Charlie in April, 2024

Source: Bizrate

Overall Rating -> 9

My first purchase went well. I will purchase more gems in the future.

Posted By NoHalalAl in March, 2024

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 9

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

Posted By Steve in August, 2023

Source: Bizrate

Overall Rating -> 10

No issues at all. It was great.

Posted By LJXK in May, 2023

Source: Bizrate

Overall Rating -> 10

I have used Gem Select many times over the past 10 years and have always been happy with the product & services

Posted By Ordain in August, 2023

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

first time here sooooooooooo we will seeeee!!!!! so far so good!!!!!!

Posted By Seastone 56 in October, 2023

Source: Bizrate

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.

Posted By T-bone in October, 2023

Source: Bizrate

Overall Rating -> 10

this was very easy im exited to get my order

Posted By Mr. in April, 2024

Source: Bizrate

Overall Rating -> 10

blessed be the lord blessed be the saved blessed be the work blessed be the traveled i write down my good times in these stones and when times are gray i can still se the sunny days refract in these stones

Posted By Kickbass.2 in May, 2023

Source: Bizrate

Overall Rating -> 8

Found on a search engine. Scanned inventory and made a small purchase.

Posted By Ralli in August, 2023

Source: Bizrate

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Gemstones A-Z

Buy Octagon Shape 10x8 mm Gems

1.54 ct Loose Round Cut Lapis Lazuli, 6 mm From Afghanistan

4.96 carat Yellow Citrine, Emerald Cut loose Citrine from Bolivia, Natural Untreated Gem, 12.1 x 10 mm

0.53 ct Orange Sphalerite, 4.7 mm Round Cut From Spain

1.53 ct Green Sphene, 6.6 x 6.2 mm Oval Cut From Sri Lanka

1.26 carat Pear Shape Chrysoberyl, loose Certified Chrysoberyl from Sri Lanka, Natural Untreated Gem, 8.2 x 5.7 mm

0.48 ct Blue Kyanite, 3.7 mm Round Cut From Nepal

0.38 ct Loose Yellow Sapphire, 4.9 x 3.2 mm Octagon Cut From Tanzania

1.07 carat Orange Sunstone, Oval loose Sunstone from India, Natural Untreated Gem, 7.8 x 6.1 mm

0.34 ct Loose Yellow Sapphire, 4.1 mm Round Cut From Tanzania

2.68 ct Round Cut Peridot, 4.5 mm From China

2.08 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 3.9 x 3 mm

5.26 carat Sky Blue Topaz, Half Drilled Briolette loose Topaz from Brazil, Natural Gems, 8.2 mm

7.53 ct Oval Prehnite, 7.8 x 7.1 mm From South Africa

1.41 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 7.4 x 6.2 mm

6.08 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 10.1 x 8.1 mm

0.93 ct Marquise Cut Color-Change Diaspore, 10.8 x 4.7 mm From Turkey

0.45 ct Loose Yellow Sapphire, 3.2 x 3.1 mm Princess Cut From Tanzania

19.4 ct Baguette Tiger's Eye, 15.9 x 11.9 mm From Thailand

3.19 ct Loose Orange Sapphire, 5.8 x 4.9 mm Oval Cut From Tanzania

0.7 carat Orange Morganite, Pear Shape loose Morganite from Afghanistan, Natural Untreated Gem, 7.6 x 5.6 mm

0.99 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gems, 7.1 x 5.1 mm

8.36 ct Asscher Cut Rose Quartz, 12.3 x 12.2 mm From South Africa

45.06 ct Oval Jasper, 38.7 x 24.2 mm From Indonesia

7.63 ct Octagon Cut Smoky Quartz, 12.1 x 12 mm From Brazil

2.91 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.1 x 10.2 mm

3.25 ct Oval Fire Agate, 10.5 x 7.4 mm From Mexico

9.14 ct Loose Baguette Lapis Lazuli, 13.2 x 9.6 mm From Afghanistan

3.32 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12 x 5.9 mm

0.64 ct Loose Purple Spinel, 5 x 4.6 mm Cushion Cut From Tanzania

1.26 carat Orange Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gem, 6 mm

29.56 ct Carved Prehnite, 16.9 x 12.5 mm From South Africa

2.43 carat Orange Spessartite Garnet, Round loose Spessartite Garnet from Mozambique, Natural Untreated Gems, 4.7 mm

Gemstone Information

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Gemstone EDUCATION

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