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

Easy and fast

Posted By Mark in February, 2024

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Overall Rating -> 10

Overall, the whole process was just great.

Posted By Thatoneguy in August, 2023

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Overall Rating -> 10

Website was incredibly easy and fast to use. Navigation and product outlay was simple and enjoyable to browse. Thank you and have a blessed day!

Posted By Devi in October, 2023

Source: Bizrate

Overall Rating -> 9

over the experience was similar to other sites i have used. The only real note I have is the checkout experience was tedious and discriminatory, i wouldn't accept visa gift cards, which not only have guaranteed funds but help protect from misuse of personal information, but would not accept my visa b/c it is a prepaid card. I don't have bank account and I have been using the prepaid card for years without issue so this was disappointing to me. I feel safer using reputable gem sites rather than amazon or ebay (I have been sold fake gems with fake certs on both), but not being able to use my own valid legitimate funds and having to find a friend to buy for me b/c I use a non-bank card like 40% of the country is insulting.

Posted By Iggywiggly in January, 2024

Source: Bizrate

Overall Rating -> 10

My last experience was good, in fact every experience I have had with them has met my expectations or surpassed them. These are really good people to work with.

Posted By Spinach in May, 2023

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Overall Rating -> 10

I found it to be easy to browse and easy to use

Posted By Kyle in December, 2023

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Overall Rating -> 10

Very excited and impressed with all your products. Keep up the good work....more different stones to choose from. I like Cabachons.

Posted By Meow in June, 2023

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Overall Rating -> 10

Great selection

Posted By GHS40 in December, 2023

Source: Bizrate

Overall Rating -> 9

So many gorgeous stones! The only "complaint" I have is it's difficult to visualize sizes in mm. Perhaps some way to compare in inches?It has been a long time since I bought stones from Gem select, but the process wasn't too difficult.

Posted By Ktreva52 in February, 2024

Source: Bizrate

Overall Rating -> 10

I love the clear description of the certification options. It's very rare to see a gem site that offers a deep explanation of each institution that would certify the stone(s).

Posted By Oakcityceo in May, 2023

Source: Bizrate

Overall Rating -> 10

The site is very easy to use and I will continue to shop here. The quality is superb

Posted By Genia in January, 2024

Source: Bizrate

Overall Rating -> 10

I have used this site for sseveral years now. All has been great. I started collection gems from GemSelect for years and wanted to collect at least one of most stones. I loved Safers because the mols is a 9 + and they come in every color. This is the best place to buy gems for the assortment and price. Great place to learn about gems too. Sometimes the shipping is a little on the long side. But I would give them a 9.9 out of 10 !!

Posted By Steve in July, 2023

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Overall Rating -> 9

An it was good.

Posted By Miguel in June, 2023

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Overall Rating -> 10

Easy to use,I have spent many hours looking at the site

Posted By Skip in November, 2023

Source: Bizrate

Overall Rating -> 9

GemSelect has a fantastic assortment of Semi-precious stones. I have not found any other web site with the variety you have.

Posted By RobDill in August, 2023

Source: Bizrate

Gemstones A-Z

Buy Octagon Shape 10x8 mm Gems

2.82 ct White Moonstone, 10.5 x 7.7 mm Oval Cut From India

3.95 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.8 x 9.2 mm

2.14 ct Green Sphene, 7.4 x 6.6 mm Oval Cut From Sri Lanka

0.6 carat Orange Spessartite Garnet, Trillion loose Spessartite Garnet from Mozambique, Natural Untreated Gem, 5 x 4.7 mm

4.38 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 14.1 x 9.9 mm

2.96 carat White Opal, Oval loose Opal from Australia, Natural Untreated Gem, 12.6 x 9.7 mm

0.76 carat Oval Emerald, loose Certified Emerald from Zambia, Natural Gem, 6.9 x 5.1 mm

0.59 carat Green Sapphire, Octagon / Scissor Cut loose Sapphire from Tanzania, Natural Gem, 4.9 x 4 mm

12.49 ct Odd Shaped Druzy Variscite, 29.9 x 13.4 mm From China

0.56 ct White Diamond, 3 x 2.6 mm Heart Cut From Brazil

1.58 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10 x 7.1 mm

3.05 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 7.1 x 5.1 mm

1.71 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8 x 6.7 mm

0.93 ct Cushion Cut Color-Change Diaspore, 7.2 x 5 mm From Turkey

2.56 carat Round Cabochon Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8.9 mm

0.93 carat Blue Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 6 x 4.9 mm

0.56 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6.1 x 4.1 mm

1.04 carat Marquise Cut Ruby, loose Certified Ruby from Myanmar, Natural Gem, 8.8 x 4.2 mm

2.08 ct Oval Cat's Eye Scapolite, 9.3 x 6.5 mm From Madagascar

0.98 ct Octagon Cut Peridot, 6.8 x 5 mm From China

2.8 ct Oval Prehnite, 9.4 x 8 mm From South Africa

10.2 ct Asscher Cut Smoky Quartz, 13 x 12.9 mm From Brazil

9.88 ct Oval Tiger's Eye, 16.3 x 12 mm From Thailand

2.04 ct Loose Orange Sapphire, 4.9 mm Round Cut From Tanzania

20.84 ct Blue Green Turquoise, 22.4 x 13.4 mm Oval Cut From the United States

2.65 ct Blue Kyanite, 10.5 x 7.2 mm Oval Cut From Nepal

4.86 ct Yellow Sillimanite, 9.7 x 7.7 mm Oval Cut From Sri Lanka

5.08 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12 x 10.2 mm

6.36 ct Yellow Quartz, 12.2 x 11.8 mm Carved From Brazil

1.23 carat Pink Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 7.5 x 5.9 mm

5.37 carat Pear Shape Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 7.2 x 5.2 mm

1.36 ct Green Sphene, 7.6 x 6.1 mm Oval Cut From Sri Lanka

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