Calibrated Size for Octagon Cut Gemstones 16x12 mm

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 16 x 12 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 good, very fast, everything as described.

Posted By B in October, 2023

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Overall Rating -> 10

Very excited and impressed with all your products. Keep up the good work....more different stones to choose from. I like Cabachons.

Posted By Meow in June, 2023

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Overall Rating -> 10

Excellent site.

Posted By Boru in December, 2023

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Overall Rating -> 10

I find the website user friendly.

Posted By Becky in August, 2023

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Overall Rating -> 10

Love the variety of stones, sizes and the prices

Posted By Dorita in March, 2024

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Overall Rating -> 10

Todo muy bien en la compra ahora esperar recibir el pedido.

Posted By MAGSMX in August, 2023

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Overall Rating -> 10

I have used GemSelect for several years and plan to shop more in the further. This is a good source of information on gemstones. I love looking at and learning about them. Lot more than I ever knew existed.

Posted By Bikerwalrus in October, 2023

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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

I bought a small ring green so I may practice my jewelry making.

Posted By HairyOtter in July, 2023

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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

Very pleased with shopping on this site. It's easy to navigate and information about gemstones is very good.

Posted By Kate in December, 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

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Overall Rating -> 10

I was looking for a source for affordable genuine gemstones for my grandson who is currently very interested in rocks and gems. I was quite surprised and pleased to find GemSelect and finding the right stones at the right price couldn't have been simpler.

Posted By Papa in December, 2023

Source: Bizrate

Overall Rating -> 10

I have had and will always have a great time shopping at GemSelect. It's a great web site with great products and great service.

Posted By Apps in November, 2023

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Overall Rating -> 10

The website is well organized and works fast forward and back. Plenty of filters. Each gem is described in detail and you receive the one pictured. Gem material info and sources available. I would like to see more specifics on sources besides country- at least region or state and in the US with Turquiose which mine. Thanks!

Posted By Orchidisle in February, 2024

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Gemstones A-Z

Buy Octagon Shape 16x12 mm Gems

30.83 ct Brown Moonstone, 22.2 x 16.1 mm Oval Cut From India

1.94 ct Yellow Beryl, 9.1 mm Round Cut From Madagascar

1.08 carat Marquise Cut Ruby, loose Certified Ruby from Myanmar, Natural Gem, 9.5 x 4.6 mm

75.34 carat Blue Aquamarine, Oval loose Aquamarine from Madagascar, Natural Untreated Gem, 40 x 24.4 mm

4.75 carat White Topaz, Round loose Topaz from Brazil, Natural Untreated Gem, 10.3 mm

30.59 ct Cushion Coral, 18.4 x 13.3 mm From Indonesia

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

28.84 ct Yellow Quartz, 23.9 x 17.3 mm Oval Cut From Brazil

28.16 ct Violet Lepidolite, 37.5 x 9.8 mm Pencil Cut From the United States

2.35 carat Sky Blue Topaz, Marquise Cut loose Topaz from Brazil, Natural Gem, 12.1 x 6.2 mm

5.97 ct Yellow Quartz, 11.8 x 11.6 mm Carved From Brazil

16.49 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 22.9 x 18.3 mm

2.06 carat Blue Zircon, Diamond-Cut loose Zircon from Cambodia, Natural Gems, 4.6 mm

3.58 ct Round Checkerboard Smoky Quartz, 7.9 mm From Brazil

4.99 ct Oval Chrysoprase, 12.6 x 9.9 mm From Madagascar

19.87 ct Odd Shaped Druzy Variscite, 36.9 x 18.8 mm From Argentina

0.7 carat Pink Malaya Garnet, Oval loose Malaya Garnet from Tanzania, Natural Untreated Gem, 6.1 x 4.3 mm

0.86 ct Yellow Morganite, 7.8 x 5.6 mm Oval Cut From Afghanistan

2.42 carat Emerald Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 5.4 x 3.8 mm

1.64 carat White Zircon, Oval loose Zircon from Cambodia, Natural Gems, 6.2 x 4.2 mm

3.13 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11 x 8.7 mm

1.04 ct Yellow Beryl, 7.1 mm Round Cut From Madagascar

5.06 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gems, 9 x 7 mm

0.58 ct Purple Spinel, 5.1 mm Round Cut From Tanzania

1.54 ct Pink Spinel, 6.7 x 6.3 mm Cushion Cut From Tanzania

0.49 carat Pear Shape Emerald, loose Certified Emerald from Colombia, Natural Gem, 6.1 x 4.1 mm

2.52 carat White Zircon, Diamond-Cut loose Zircon from Myanmar, Natural Gems, 6.1 mm

19.81 ct Oval Rainbow Moonstone, 21.9 x 15.4 mm From the United States

2.73 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 12 x 10 mm

1.28 ct Orange Sphalerite, 6.3 mm Round Cut From Spain

3.43 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 11.1 x 9 mm

14.09 ct Blue Green Grandidierite, 15.9 x 13.2 mm Oval Cut From Madagascar

Gemstone Information

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