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

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Gemstones A-Z

Buy Octagon Shape 10x8 mm Gems

0.14 ct Marquise Cut Iolite, 6.1 x 2.9 mm From Madagascar

3.44 ct Oval Tiger's Eye, 11 x 9 mm From Thailand

38.17 ct Round Hematite, 21.6 mm From Brazil

12.01 ct Yellow Quartz, 16.1 mm Round Concave Cut From Brazil

6.77 ct Diamond Cut Smoky Quartz, 12.5 mm From Brazil

6.95 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 12 mm

0.61 carat Blue Sapphire, Diamond-Cut loose Sapphire from Madagascar, Natural Gem, 5.1 mm

0.53 carat Orange Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 6.2 x 4.1 mm

7.49 carat Round Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 13 mm

13.22 ct Oval Star Ruby, 14.9 x 12.6 mm From Madagascar

1.42 ct Round Onyx, 7.1 mm From Sri Lanka

3.15 carat Sky Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 5 mm

7.69 ct Yellow Quartz, 9.5 x 9.5 mm Carved From Brazil

0.5 carat Emerald Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 5.1 x 4 mm

3.67 ct Pink Morganite, 11.5 x 9 mm Oval Cut From Afghanistan

4.31 ct Round Rutile Quartz, 11.2 mm From India

0.54 ct Oval Chrysoberyl Cat's Eye, 6 x 4 mm From Sri Lanka

1.09 carat Yellow Citrine, Trillion loose Citrine from Brazil, Natural Untreated Gem, 7 x 7 mm

1.97 ct Loose Oval Cut Black Opal, 11 x 8.4 mm From Ethiopia

20.97 ct Oval Pietersite, 30.1 x 21.9 mm From Namibia

15.97 ct Oval Serpentine, 20.6 x 14.1 mm From the United States

1.81 carat Yellow Citrine, Round loose Citrine from Brazil, Natural Untreated Gem, 8 mm

2.11 carat Sky Blue Topaz, Oval loose Topaz from Brazil, Natural Gems, 6.9 x 5 mm

8.83 carat Black Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 14.1 x 9.7 mm

1.94 carat Round Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 5.1 mm

1.85 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 8.8 x 6.9 mm

33.3 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 23.4 x 16.1 mm

2.08 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 24.6 x 3.2 mm

2.39 carat Oval Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 6.1 x 4.1 mm

22.85 ct Oval Jasper, 24.3 x 13.3 mm From Indonesia

9.74 ct Oval Agate, 13.9 x 12.8 mm From Indonesia

2.66 carat Blue Tanzanite, Oval loose Tanzanite from Tanzania, Natural Gem, 9 x 7.1 mm

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