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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Overall Rating -> 10

Great selection, I love your site! Great product visibility, information, etc.

Posted By John in February, 2024

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Overall Rating -> 10

Very detailed and great pictures

Posted By Alexandrite in November, 2023

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Overall Rating -> 10

Fine. All emails answered. Excellent service. Nice discount added for orders. Briefly, a very good experience.

Posted By C.J. in February, 2024

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Overall Rating -> 8

Found on a search engine. Scanned inventory and made a small purchase.

Posted By Ralli in August, 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 -> 10

I really enjoy browsing through GemSelect. The selection is always marvelous and I love how detailed everything is described. The only thing I noticed is that when browsing through my phone, the videos of the gems do not load. If there were more videos of the gems, that would be amazing, though I understand that is a lot of work on GemSelect's part! Checking out is also very fast and easy, and I love that the return policy is very good, though I hope I don't have to use it anytime soon.

Posted By ChiChi 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 had a great time searching all the lovely stones. This is my first precious loose stone purchase for my own work. I chose sapphire, and found some lovely briolettes. I wanted 3, but this set of 4 was perfect. Everything was quick and easy, and I'm excited.

Posted By Phoenix in February, 2024

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Overall Rating -> 10

I FOUND WHAT I WANT IT

Posted By GABY in March, 2024

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Overall Rating -> 10

Very good customer service. I had an issue on my end with shipping and I received a response the next day!

Posted By Orphanboy in December, 2023

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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 -> 9

My first purchase went well. I will purchase more gems in the future.

Posted By NoHalalAl in March, 2024

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Overall Rating -> 10

Perfect size I was looking for and great price

Posted By Izzy in September, 2023

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Overall Rating -> 10

Always have good experience

Posted By Ginnie in September, 2023

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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

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Gemstones A-Z

Buy Octagon Shape 5x3 mm Gems

16.09 ct Carved Ruby-Zoisite, 15.6 x 15.3 mm From Tanzania

0.34 ct Loose Yellow Sapphire, 4.4 x 4.3 mm Heart Cut From Tanzania

2.63 ct Oval Prehnite, 8.2 x 5.8 mm From South Africa

5.35 ct Yellow Quartz, 12 mm Round Concave Cut From Brazil

5.64 ct Marquise Smoky Quartz, 22.2 x 8.9 mm From Brazil

4.01 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12.1 x 9.9 mm

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

3.65 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gem, 15 x 7.2 mm

3.34 ct Oval Chrysoprase, 11.2 x 9.2 mm From Madagascar

0.78 carat Oval Peridot, loose Certified Peridot from China, Natural Untreated Gem, 6.9 x 5.1 mm

1.65 ct Oval Cat's Eye Moonstone, 6.8 x 5 mm From India

8.76 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 14.1 x 10.1 mm

3.3 carat Green Sapphire, Oval loose Sapphire from Tanzania, Natural Gems, 6 x 5.1 mm

0.81 carat Blue Sapphire, Marquise-Cut loose Sapphire from Madagascar, Natural Gem, 8 x 4.1 mm

1.8 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 11.9 x 6 mm

0.67 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 6.1 x 4 mm

10.87 carat Gray Pearl, Baroque loose Pearl from South Sea, Natural Gem, 12.3 mm

11.3 ct Fancy Pietersite, 23.4 x 7.2 mm From Namibia

8.94 ct Marquise Rutile Quartz, 20.1 x 10.1 mm From India

0.62 ct Red Spinel, 5.4 x 4.3 mm Cushion Cut From Tanzania

5.06 ct Round Cut Smoky Quartz, 11 mm From Brazil

1.71 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7.1 x 5.1 mm

11.68 carat Half Drilled Briolette Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 18.8 mm

10.38 ct Fancy Fire Agate, 15 x 12.6 mm From Mexico

7.57 ct Black Spinel, 9.1 mm Round Rose Cut From Thailand

55.74 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 26.5 x 23 mm

0.62 ct Oval Chrysoberyl Cat's Eye, 5.9 x 4.6 mm From Sri Lanka

24.5 ct Loose Violet Lepidolite, 38 x 9.1 mm Pencil Cut From the United States

5.54 ct Oval Prehnite, 7.5 x 6.4 mm From South Africa

3.03 ct Round Onyx, 7.1 mm From Sri Lanka

1.35 carat Princess-Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 7.1 x 7 mm

8.19 carat Swiss Blue Topaz, Marquise-Cut loose Topaz from Brazil, Natural Gems, 13.9 x 8 mm

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