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

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

Posted By Seastone 56 in October, 2023

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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

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Overall Rating -> 10

Gem Select has gems at afffordable prices.

Posted By George in March, 2024

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Overall Rating -> 10

Purchasing from Gem Select was a pleasant and easy experience. The photos of the stones I was interested in were an accurate depiction of the stones I received. Ordering was easy and the items arrived within a week. Over all it was a very positive experience.

Posted By Dee in September, 2023

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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 -> 10

Was easy to search for many gems and mineral stones.Authenticity of natural stones is important, and I feel this site offers some assurance on this.

Posted By DanM in November, 2023

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Overall Rating -> 10

I was pleased with the selection of gems, the ease of navigating, and the smooth checkout

Posted By JamesMichael781 in September, 2023

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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 -> 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 -> 8

I am currently pleased. I like the layout of the website.

Posted By RayPoppa in January, 2024

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Overall Rating -> 10

My overall interaction with your website was pleasant, as always.

Posted By RJ in April, 2024

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Overall Rating -> 8

Many gems at reasonable pricing

Posted By Skittlebird in May, 2024

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Overall Rating -> 10

I have started a small gem brokerage. I find stones to meet clients needs. Gemselect has helped me find what people what.

Posted By Pirates Bounty in April, 2024

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Overall Rating -> 10

Always have good experience

Posted By Ginnie in September, 2023

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Overall Rating -> 10

great. thank you

Posted By Carrotroller in July, 2023

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Gemstones A-Z

Buy Octagon Shape 10x8 mm Gems

2.45 ct Round Cut Peridot, 4.4 mm From China

0.91 carat Green Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 5.2 x 5.1 mm

3.5 ct Blue Star Sapphire, 7 x 5.2 mm Oval Cut From Thailand

1.8 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 19.3 x 3.3 mm

1.83 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 10.8 x 4.8 mm

1.74 ct Round Cut Strawberry Quartz, 7.9 mm From Russia

2.53 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.1 x 4.1 mm

7.88 ct Marquise Slice Ruby in Fuchsite, 21.3 x 11.4 mm From Ethiopia

5.94 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 9.1 x 7.3 mm

2.49 carat Oval Demantoid Garnet, loose Certified Demantoid Garnet from Namibia, Natural Untreated Gems, 5.4 x 4.2 mm

7.65 carat Oval Star Garnet, loose Certified Star Garnet from India, Natural Untreated Gem, 11.5 x 9.5 mm

23.4 ct Loose Blue Green Turquoise, 22.9 x 14.8 mm Oval Cut From the United States

46.47 ct Oval Jasper, 30.2 x 22.2 mm From Indonesia

13.86 carat Pear Rutile Quartz, loose Certified Rutile Quartz from India, Natural Untreated Gem, 21.7 x 15.2 mm

1.28 carat Pear Black Opal, loose Certified Black Opal from Ethiopia, Natural Gem, 10 x 6.6 mm

7.08 carat Pear Shape Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 15.3 x 11.5 mm

1.26 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gems, 5.1 mm

2.08 ct Oval Carnelian, 8.9 x 7 mm From India

6.51 carat Pear Shape Smoky Quartz, loose Certified Smoky Quartz from Brazil, Natural Untreated Gem, 15.2 x 11.1 mm

47.24 ct Oval Rose Quartz, 22.6 x 19.9 mm From South Africa

1.34 ct Oval Sillimanite Cat's Eye, 7.4 x 5.4 mm From Madagascar

34.86 ct Oval Rhodochrosite, 27.7 x 19.9 mm From South Africa

2.83 ct Pink Morganite, 10.5 x 9.8 mm Trillion Cut From Afghanistan

3.01 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 9.1 x 6.9 mm

28.48 ct Oval Bloodstone, 18.2 x 15.6 mm From Madagascar

61.24 ct Oval Tiger's Eye Matrix, 41.4 x 25 mm From Mexico

1.4 ct Loose Cushion Cut Mystic Quartz, 6.9 x 6.9 mm From Brazil

0.17 ct White Diamond, 2.7 mm Diamond Cut From India

12.29 ct Black Spinel, 11.9 mm Round Rose Cut From Thailand

2.16 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gem, 8.1 x 6.1 mm

2.97 carat Yellow Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 10.2 x 7.7 mm

2.64 carat Pear Shape Opal, loose Certified Opal from Australia, Natural Untreated Gem, 16.9 x 7.2 mm

Gemstone Information

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