Calibrated 10 x 8 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 10 x 8 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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Gemstones A-Z

Buy Octagon Shape 10x8 mm Gems

1.61 ct Pink Morganite, 8 mm Round Cut From Afghanistan

0.67 ct Oval Cut Fire Opal, 8 x 6 mm From Mexico

1.39 carat Green Sapphire, Pear Cabochon loose Sapphire from Madagascar, Natural Gem, 6.3 x 5.2 mm

4.31 ct Round Rutile Quartz, 11 mm From India

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

5.26 carat Sky Blue Topaz, Half Drilled Briolette loose Topaz from Brazil, Natural Gems, 8.2 mm

0.4 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 5.3 x 4.3 mm

23.33 carat Swiss Blue Topaz, Oval loose Topaz from Brazil, Natural Gem, 19.8 x 14.8 mm

1.95 carat London Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 7.2 x 5.1 mm

2.67 carat Swiss Blue Topaz, Briolette loose Topaz from Brazil, Natural Gem, 11.1 mm

3.09 ct Green Agate, 17.4 x 8.9 mm Carved From India

0.98 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 12.1 x 4.1 mm

3.36 ct Loose Pink Sapphire, 3.2 mm Round Cabochon From Madagascar

26.72 ct Loose Oval Agate, 24.6 x 16.6 mm From Indonesia

0.73 ct Loose Orange Sapphire, 6.2 x 4.2 mm Oval Cut From Tanzania

9.33 carat Round Cabochon Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 8.7 mm

2.4 ct Orange Moonstone, 8.1 x 8.1 mm Cushion Cut From India

2.24 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 8.9 x 8.9 mm

2.69 ct Purple Kunzite, 8 x 5.8 mm Octagon Cut From Afghanistan

0.79 carat Orange Hessonite Garnet, Pear Shape loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.9 x 5.2 mm

3.91 carat Pear Malachite, loose Certified Malachite from Congo, Natural Untreated Gem, 10.1 x 8.5 mm

19.67 ct Odd Shaped Druzy Azurite, 22.8 x 21 mm From the United States

1.03 ct Loose Yellow Sapphire, 5.6 mm Round Cut From Tanzania

1.45 ct Blue Kyanite, 6.9 x 5.1 mm Oval Cut From Nepal

0.5 carat Yellow Sapphire, Heart loose from Tanzania, Natural Gem, 4.5 x 4.4 mm

2.18 ct Round Cat's Eye Scapolite, 8.5 mm From Madagascar

2.21 ct Loose Green Tourmaline, 9.1 x 6.8 mm Oval Cabochon From Mozambique

2.19 carat Black Star Sapphire, Pear loose Star Sapphire from Thailand, Natural Gem, 8.8 x 7.6 mm

0.94 ct Octagon Cut Color-Change Diaspore, 5.9 x 5.1 mm From Turkey

1.83 carat Swiss Blue Topaz, Emerald-Cut loose Topaz from Brazil, Natural Gem, 8 x 6.1 mm

6.07 ct Baguette Tiger's Eye Matrix, 14.2 x 10.4 mm From Mexico

26.95 carat Pear Jasper, loose Certified Jasper from Indonesia, Natural Untreated Gem, 20.6 x 20.4 mm

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