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

1.82 ct Loose Orange Moonstone, 10.2 x 5.1 mm Marquise Cut From India

13.54 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 15.8 x 11.7 mm

32.74 ct Round Maw-Sit-Sit, 20.1 mm From Myanmar

1.51 carat Swiss Blue Topaz, Pear Shape loose Topaz from Brazil, Natural Gems, 7 x 4.9 mm

1.88 carat Yellow Citrine, Marquise Cut loose Citrine from Brazil, Natural Untreated Gems, 9.1 x 5.1 mm

33.08 ct Oval Rose Quartz, 22 x 19.1 mm From South Africa

7.28 ct Oval Star Ruby, 12.8 x 10.7 mm From Madagascar

3.64 ct Oval Rutile Quartz, 11.1 x 9 mm From India

14.15 ct Gray Jadeite, 17 x 12.7 mm Oval Cut From Myanmar

1.89 ct Blue Star Sapphire, 8 x 6.2 mm Oval Cut From Thailand

0.68 ct Blue Kyanite, 6.2 x 4.2 mm Oval Cut From Nepal

39.47 ct Baguette Charoite, 32.2 x 19.8 mm From Russia

1.06 carat Orange Hessonite Garnet, Pear Shape loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8 x 5.6 mm

1.24 carat Green Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 13.5 x 3.6 mm

5.17 carat Black Tourmaline, Emerald Cut loose Tourmaline from Mozambique, Natural Untreated Gem, 24.4 x 5.1 mm

4.28 carat Sky Blue Topaz, Princess-Cut loose Topaz from Brazil, Natural Gems, 7 x 7 mm

31.7 ct Oval Charoite, 29.2 x 19.4 mm From Russia

1.51 ct Purple Spinel, 6.5 x 6.3 mm Cushion Cut From Tanzania

3.98 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 12 x 6 mm

98.71 ct Green Agate, 28.9 x 28.3 mm Pyramid Cut From Indonesia

0.49 ct Loose Pink Sapphire, 5.1 x 4.2 mm Oval Cut From Madagascar

19.09 ct Oval Agate, 18.1 x 15.6 mm From Indonesia

35.16 ct Oval Rose Quartz, 22.2 x 18.2 mm From South Africa

2.53 ct Round Cut Rainbow Moonstone, 7.2 mm From the United States

0.21 carat Oval Tsavorite Garnet, loose Certified Tsavorite Garnet from Tanzania, Natural Untreated Gem, 4.7 x 3 mm

8 ct Yellow Quartz, 14 mm Round Concave Cut From Brazil

36.52 ct Oval Pietersite, 30.3 x 22.3 mm From Namibia

8.61 ct Round Rutile Quartz, 13 mm From India

1.55 carat Oval Color-Change Garnet, loose Certified Color-Change Garnet from Brazil, Natural Untreated Gem, 6.9 x 5.8 mm

1.05 ct Octagon Cut Color-Change Diaspore, 7.3 x 4.2 mm From Turkey

1.14 ct Loose Oval Cut Black Opal, 9.2 x 7.3 mm From Ethiopia

1.07 carat Marquise Cut Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gem, 10.1 x 5 mm

Gemstone Information

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