Calibrated 5 x 3 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 5 x 3 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 to navigate

Posted By G Funk in December, 2023

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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

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Overall Rating -> 10

Excellent selection of products. Website easy to navigate and make purchases.

Posted By David in April, 2023

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Overall Rating -> 10

I’ve enjoyed purchasing stones from this site. It’s convenient and fairly priced.

Posted By Chico in May, 2023

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Overall Rating -> 10

Love Gem select. great gems for the price. Can't beet them

Posted By Apps in September, 2023

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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

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Overall Rating -> 9

An it was good.

Posted By Miguel in June, 2023

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Overall Rating -> 10

I have used gm select a while ago and was always pleased with the products

Posted By Jaytee in November, 2023

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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 -> 10

The gem stone always has a great selection of beautiful stones. The calibrated stone fit my ring perfectly. Thank you gem select !

Posted By Jen in August, 2023

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Overall Rating -> 8

purchased birthstones to be mounted into stud earrings as a gift for a friend's gift

Posted By MI photo in May, 2023

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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

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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

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

The website was very easy to navigate. We appreciated the details about each gem, and the sort and search features of the website were helpful and easy to use.

Posted By AV in May, 2023

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Gemstones A-Z

Buy Octagon Shape 5x3 mm Gems

0.02 ct Loose Blue Diamond, 1.9 mm Diamond Cut From India

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

2.43 ct Loose Orange Moonstone, 8.1 x 8 mm Cushion Cut From India

2.99 ct Yellow Sphene, 8.7 x 8 mm Oval Cut From Sri Lanka

4 ct Orange Sunstone, 7 x 5.1 mm Oval Cut From Russia

1.48 carat Purple Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Untreated Gem, 8.5 x 6.3 mm

2.22 carat Sky Blue Topaz, Marquise Cut loose Topaz from Brazil, Natural Gem, 11.9 x 6.2 mm

0.23 carat Square Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.5 x 3.4 mm

0.69 carat Green Sapphire, Cushion loose Sapphire from Madagascar, Natural Gem, 4.6 x 4.5 mm

2.26 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7.1 x 5.2 mm

8.4 ct Yellow Quartz, 14.1 x 12.2 mm Carved From Brazil

2.8 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.1 mm

25.5 ct Trillion Boulder Opal, 22.1 x 21.4 mm From Australia

0.06 ct Green Diamond, 2.5 mm Diamond Cut From India

14.7 ct Cushion Cut Nuummite, 18.3 x 13.2 mm From India

1.72 carat Yellow Citrine, Trillion Buff Top loose Citrine from Brazil, Natural Untreated Gem, 8.1 x 7.9 mm

1.13 carat Pear Shape Kornerupine, loose Certified Kornerupine from Sri Lanka, Natural Untreated Gem, 8.6 x 5.8 mm

3.83 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.1 x 4.1 mm

0.61 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 7 x 4.9 mm

29.48 ct Marquise Jasper, 34.9 x 15.7 mm From Indonesia

0.43 ct Loose Yellow Sapphire, 4.4 mm Round Cut From Tanzania

0.44 ct Orange Sphalerite, 4.7 mm Round Cut From Spain

4.09 ct Oval Strawberry Quartz, 12.8 x 9.3 mm From Brazil

2.47 ct Round Strawberry Quartz, 8.8 mm From Russia

4.98 ct Oval Cut Peridot, 7.8 x 5.7 mm From China

1.35 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.8 x 4.7 mm

6.91 ct Black Spinel, 9.2 mm Round Rose Cut From Thailand

23.22 ct Pencil Cut Jasper, 35.7 x 9.9 mm From Indonesia

2.76 ct Loose Orange Moonstone, 8.2 x 8 mm Trillion Cut From India

1.31 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 7.3 x 6.2 mm

1.15 carat Green Sapphire, Round loose Sapphire from Tanzania, Natural Gems, 4.2 mm

1.7 carat Round Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 7 mm

Gemstone Information

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Gemstone EDUCATION

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