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

The website is user friendly, has excellent selection. I've always found what I was looking for with Gem Select. When others don't have it they do. And most important, they have a way for you to pay without using PayPal. I cannot use PayPal they closed my account because of no cell phone.

Posted By NJD in September, 2023

Source: Bizrate

Overall Rating -> 10

The website design is a bit finicky for mobile, but Im sure its most likely just a mobile issue. Amazing selection of products, great prices.

Posted By Kuba in December, 2023

Source: Bizrate

Overall Rating -> 10

I find the website user friendly.

Posted By Becky in August, 2023

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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

After having looked at other purchasing sites, this is my first choice.

Posted By MJC in January, 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

Source: Bizrate

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 -> 9

Never bought anything on this website before, but it probably won't be my last purchase. Definitely one of the easiest to use and most informative sites I've ever been to.

Posted By Bob in November, 2023

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Overall Rating -> 9

Good interaction with site

Posted By Brick in September, 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

Source: Bizrate

Overall Rating -> 10

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023

Source: Bizrate

Overall Rating -> 10

My first order. I am anxious to see if what I ordered is what I receive.

Posted By KRJ in July, 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

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 -> 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

Gemstones A-Z

Buy Octagon Shape 10x8 mm Gems

1.53 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8 x 6.3 mm

4.08 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 10.1 x 8 mm

2.71 ct Oval Cut Golden Beryl, 9.1 x 6.8 mm From Madagascar

0.47 carat London Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 7 x 3.4 mm

18.04 ct Carved Prehnite, 18.2 x 12.3 mm From South Africa

5.29 ct Fancy Fire Agate, 13.9 x 10.2 mm From Mexico

1.99 carat Oval Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 7 x 4.9 mm

3.02 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.1 x 10 mm

4.52 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14 x 9.8 mm

45.53 ct Baguette Jasper, 40.3 x 21.4 mm From Indonesia

5.18 ct Yellow Quartz, 8 x 7.8 mm Carved From Brazil

0.84 ct Octagon Cut Color-Change Diaspore, 7.3 x 4.5 mm From Turkey

29.26 ct Loose Oval Malachite, 21.2 x 15.6 mm From Congo

7.11 ct Oval Strawberry Quartz, 13.2 x 10.9 mm From Russia

1.83 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 9.9 x 5 mm

1.12 ct Purple Spinel, 6.3 x 6.1 mm Cushion Cut From Tanzania

0.35 carat Green Sapphire, Heart loose Sapphire from Tanzania, Natural Gem, 4.5 x 4.4 mm

3.64 ct Asscher Cut Rose Quartz, 9.5 x 9.5 mm From South Africa

0.59 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6 x 4.1 mm

7.84 ct Loose Oval Lapis Lazuli, 14.5 x 10.7 mm From Afghanistan

5.23 ct Loose Orange Moonstone, 9.1 x 7.1 mm Cushion Cut From India

6.7 ct Pink Kunzite, 10.9 x 9.5 mm Oval Cut From Afghanistan

3.43 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.2 mm

21.84 ct Oval Jasper, 27.6 x 19 mm From Indonesia

3.9 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6 x 4.1 mm

2.52 ct Fancy Fire Agate, 12.1 x 7.7 mm From Mexico

3.01 ct Loose Pink Tourmaline, 8.1 x 6.1 mm Oval Cabochon From Mozambique

11.5 ct Fancy Jasper, 20.2 x 13.6 mm From Mexico

8.89 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 21 x 13 mm

1.33 ct Oval Cut Rainbow Moonstone, 7.8 x 6 mm From the United States

6.28 ct Round Pietersite, 11.8 mm From Namibia

0.77 ct Loose White Sapphire, 4.3 mm Diamond Cut From Madagascar

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