Calibrated 27 x 20 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 27 x 20 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 detailed and great pictures

Posted By Alexandrite in November, 2023

Source: Bizrate

Overall Rating -> 8

Good quality fairly priced.

Posted By CassiusGrey in May, 2024

Source: Bizrate

Overall Rating -> 10

I searched for the item by description and millimeter and had my choice come up and then made the best selection.

Posted By Tim in April, 2024

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

Easy and fast

Posted By Mark in February, 2024

Source: Bizrate

Overall Rating -> 10

Very large selection of items and we used the stones to have several pieces of jewelry made for us.

Posted By Joe in January, 2024

Source: Bizrate

Overall Rating -> 9

Easy to use. Limited supply of higher quality gemstones.

Posted By Newfguy in February, 2024

Source: Bizrate

Overall Rating -> 9

Gemselect is a good website with a great selection of loose gems for sale. The prices are fairly decent, with the only negative being the cut quality of the gems. This is my go to retailer for gemstones and will continue to be, given that the packages arrive in a timely manner.

Posted By Lunchies in April, 2024

Source: Bizrate

Overall Rating -> 8

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

Posted By Ralli in August, 2023

Source: Bizrate

Overall Rating -> 10

Easy to navigate

Posted By G Funk in December, 2023

Source: Bizrate

Overall Rating -> 10

Great site always looking for great deals and find them on this site

Posted By IRO5812 in July, 2024

Source: Bizrate

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

Source: Bizrate

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

Source: Bizrate

Overall Rating -> 10

first time here sooooooooooo we will seeeee!!!!! so far so good!!!!!!

Posted By Seastone 56 in October, 2023

Source: Bizrate

Overall Rating -> 10

Convenient selection, arrival on time

Posted By Alin in February, 2024

Source: Bizrate

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Buy Octagon Shape 27 x 20 mm Gems

1.24 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 11.1 x 3.6 mm

0.44 ct Loose Orange Sapphire, 5 x 2.6 mm Marquise Cut From Tanzania

0.14 ct White Diamond, 2.7 mm Diamond Cut From Brazil

2.94 carat Swiss Blue Topaz, Fancy-Cut loose Topaz from Brazil, Natural Gems, 7.2 x 5.2 mm

1.73 ct Oval Strawberry Quartz, 8.2 x 6.2 mm From Russia

0.74 ct Yellow Beryl, 6.9 x 5.1 mm Oval Cut From Madagascar

4.67 ct Carved Prehnite, 14 x 9.7 mm From South Africa

2.17 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 7 x 7 mm

3.6 carat White Topaz, Round loose Topaz from Brazil, Natural Untreated Gem, 9.3 mm

5.81 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gem, 14.2 x 10.2 mm

0.95 ct Green Sphene, 5.8 x 5.5 mm Oval Cut From Sri Lanka

0.73 ct Loose Pink Sapphire, 6.4 x 4.5 mm Oval Cut From Madagascar

6.41 carat Pear Black Opal, loose Certified Black Opal from Ethiopia, Natural Gem, 15.4 x 10.5 mm

19.92 ct Oval Obsidian, 26.4 x 20.5 mm From India

0.89 carat London Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gem, 7 x 5 mm

1.36 ct Loose Yellow Sapphire, 5 mm Round Cut From Tanzania

0.59 carat Yellow Citrine, Pear Shape loose Citrine from Brazil, Natural Untreated Gem, 6.9 x 5 mm

22.82 carat Pear Tiger's Eye, loose Certified Tiger's Eye from Thailand, Natural Untreated Gems, 18.1 x 13 mm

2.04 carat Swiss Blue Topaz for Sale, Emerald-Cut loose Topaz from Brazil, Natural Gem, 7.9 x 6 mm

2.32 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 11.8 x 8.8 mm

1.42 carat Pink Tourmaline, Round Cabochon loose Tourmaline from Mozambique, Natural Untreated Gem, 6.7 mm

33.83 ct Oval Jasper, 32.7 x 13.9 mm From Indonesia

10.27 ct Round Rutile Quartz, 14.9 mm From India

7.24 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gems, 10.8 x 9 mm

2.75 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 10.1 x 9.9 mm

1.9 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.3 x 6.9 mm

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

3.88 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12.1 x 5.9 mm

0.61 ct Loose Yellow Sapphire, 6.6 x 4.7 mm Oval Cut From Tanzania

1.24 ct Cushion Cut Color-Change Diaspore, 9.4 x 4.2 mm From Turkey

2.19 ct Pink Morganite, 8.2 x 6.2 mm Oval Cut From Afghanistan

43.76 carat Pear Dendritic Agate, loose Certified Dendritic Agate from India, Natural Untreated Gem, 38.9 x 21.6 mm

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