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

Very easy. I have purchased a few times before and was satisfied each time. Thank you.

Posted By Ray in December, 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 -> 9

making my own jewelry for my birth stone

Posted By LoveGeo in July, 2023

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Overall Rating -> 10

Great selection and excellent website.

Posted By JBW in October, 2023

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Overall Rating -> 10

Pleasant.

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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

all good

Posted By John in December, 2023

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Overall Rating -> 9

Easy to use. Limited supply of higher quality gemstones.

Posted By Newfguy in February, 2024

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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

I searched for the item by description and millimeter and had my choice come up and then made the best selection.

Posted By Tim in April, 2024

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Overall Rating -> 10

I have actually done business with them before and was quite satisfied with them then.My Mother collected turtle items and when I saw the Mother of Pearl turtle...I just thought of her and decided to buy it. It's even tinier than I thought, but so adorable!The gemstones I bought are for jewelry for my daughter's birthday.

Posted By Ktreva52 in February, 2024

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Overall Rating -> 10

Had a problem ordering first time. Someone from Gem Select reached out to me and cleared problem and I made purchase.

Posted By Myrtle in February, 2024

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Overall Rating -> 10

Wonderful selection of gems to choose from. Have made many purchases and was only slightly disappointed once.

Posted By Teemo in February, 2024

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Overall Rating -> 10

great. thank you

Posted By Carrotroller in July, 2023

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Overall Rating -> 10

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Gemstones A-Z

Buy Octagon Shape 10x8 mm Gems

3.64 ct Round Checkerboard Smoky Quartz, 7.7 mm From Brazil

0.83 ct Square Cut Color-Change Diaspore, 5.1 x 4.9 mm From Turkey

2.19 carat Princess-Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 8 x 7.9 mm

1.68 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 6 x 6.1 mm

0.38 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 6 x 4.1 mm

0.61 ct Loose Blue Sapphire, 4.9 x 4.1 mm Cushion Cut From Madagascar

0.5 ct Loose Purple Sapphire, 4.9 x 3.1 mm Oval Cut From Tanzania

3.23 ct Yellow Quartz, 10.4 x 10.4 mm Carved From Brazil

24.77 ct Yellow Quartz, 16 x 15.4 mm Carved From Brazil

1.24 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 8 x 6 mm

1.88 carat White Zircon, Round loose Zircon from Cambodia, Natural Gem, 6.8 mm

0.87 ct Blue Kyanite, 7.1 x 4.9 mm Oval Cut From Nepal

0.52 ct Loose Yellow Sapphire, 4.5 x 4.4 mm Heart Cut From Tanzania

2.55 carat White Topaz, Oval loose Topaz from Brazil, Natural Untreated Gems, 10 x 4.1 mm

10.9 ct Green Amazonite, 10.3 x 10.3 mm Cushion Cut From Madagascar

12.67 ct Odd Shaped Druzy Variscite, 27 x 14.2 mm From China

6.34 carat London Blue Topaz, Heart loose Topaz from Brazil, Natural Gem, 11.2 x 10.7 mm

7.86 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 10.1 x 7.7 mm

12.63 ct Odd Shaped Druzy Variscite, 25.5 x 14.5 mm From Australia

1.37 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 9.8 x 4.8 mm

1.05 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6.2 x 4.2 mm

35.88 ct Oval Star Ruby, 19.9 x 18.1 mm From Madagascar

2.05 ct Oval Prehnite, 8.4 x 6.4 mm From South Africa

2.23 ct Oval Sillimanite Cat's Eye, 7.1 x 4.9 mm From Madagascar

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

0.59 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 5.9 x 4 mm

22.92 ct Oval Rose Quartz, 19.9 x 15.2 mm From South Africa

1.97 carat Baguette Facet Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gems, 2.9 x 1.9 mm

2.05 carat Blue Green Fluorite, Pear Shape loose Fluorite from India, Natural Untreated Gem, 8.6 x 6.4 mm

13.72 carat Gray Pearl, Ball loose Pearl from South Sea, Natural Gem, 12.4 mm

6.25 carat Green Sapphire, Oval loose Sapphire from Madagascar, Natural Gem, 12.6 x 10.4 mm

7.03 ct Square Lapis Lazuli, 11 x 10.9 mm From Afghanistan

Gemstone Information

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