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

Excellent site.

Posted By Boru in December, 2023

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Overall Rating -> 10

I am excited for my first order, search tools were a great help to find the sapphire I needed for my next project! Thank you

Posted By Sue in April, 2023

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Overall Rating -> 9

It went well

Posted By Rob in December, 2023

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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

Everything fine.

Posted By Hilario in December, 2023

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Overall Rating -> 8

Very easy to find the specific stone I was looking for. I am pleased by both the selection and the price of the stones that are available. The only "bad" thing that I have to say is that the interface of the site is outdated.

Posted By Nick in March, 2024

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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

It was easy to find the color gem I desired and checkout was simple as well. Very excited to receive my gemstone.

Posted By Nikki J in September, 2023

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Overall Rating -> 10

This is only the second time I have ordered from GemSelect. I am a prolific gemstone collector and I wish I had found this site sooner!

Posted By Beachcomber in September, 2023

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Overall Rating -> 10

Pleasant.

Posted By Mk in November, 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

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

Always have good experience

Posted By Ginnie in September, 2023

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Overall Rating -> 9

Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

Posted By Erick in July, 2023

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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Gemstones A-Z

Buy Octagon Shape 5x3 mm Gems

4.58 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11 mm

6.84 ct Oval Actinolite Cat's Eye, 13.6 x 10.3 mm From the United States

7.25 ct Yellow Quartz, 13.1 x 11.9 mm Carved From Brazil

3.18 carat Marquise Cut Rhodolite Garnet, loose Certified Rhodolite Garnet from Mozambique, Natural Untreated Gems, 9 x 4.5 mm

16.08 carat Sky Blue Topaz, Carved Leaf loose Topaz from Brazil, Natural Gem, 21.1 x 10.8 mm

23.96 carat Emerald Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 20.3 x 15.2 mm

34.58 ct Octagon Cut Rutile Quartz, 25.4 x 18.1 mm From India

4.48 ct Loose Oval Cut Strawberry Quartz, 12.1 x 9.9 mm From India

15.65 ct Oval Checkerboard Labradorite, 18.2 x 13.2 mm From Madagascar

0.82 ct Loose Orange Sapphire, 6.5 x 4.9 mm Oval Cut From Madagascar

4.68 carat Yellow Citrine, Briolette loose Citrine from Brazil, Natural Untreated Gem, 13.6 mm

1.81 carat Yellow Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Untreated Gem, 6.9 mm

27.6 ct Drilled Sphere Rutile Quartz, 12.3 mm From India

2.72 carat Swiss Blue Topaz, Briolette loose Topaz from Brazil, Natural Gem, 10.9 mm

15.53 ct Oval Rhodochrosite, 18.2 x 13.1 mm From South Africa

3.1 carat Briolette Tourmaline, loose Certified Tourmaline from Mozambique, Natural Untreated Gems, 5.7 mm

5.17 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 24.4 x 5.1 mm

0.14 carat Baguette Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 3.1 x 2.7 mm

3.35 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5.1 mm

1.45 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 17.7 x 3.7 mm

0.66 carat Orange Hessonite Garnet, Baguette Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 5 x 4.2 mm

24.15 ct Cushion Fossil Coral, 16.9 x 13.4 mm From Indonesia

2.55 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11 x 8.8 mm

0.96 carat Heart Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.9 x 4.9 mm

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

0.71 ct Loose Pink Sapphire, 5 x 4 mm Oval Cut From Madagascar

2.49 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 7.1 x 5.2 mm

11.38 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 16.2 x 12 mm

7.09 carat Blue Green Fluorite, Oval loose Fluorite from India, Natural Untreated Gem, 12.8 x 9.4 mm

0.53 ct Loose Orange Sapphire, 4.9 x 4 mm Octagon Cut From Tanzania

5.18 ct Round Concave Cut Mystic Quartz, 12.1 mm From Brazil

11 ct White Quartz, 14.1 x 14 mm Asscher Cut From Brazil

Gemstone Information

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