Calibrated 14 x 12 mm Octagon Shape Gemstones from 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 14 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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Gemstones A-Z

Buy Octagon Shape 14x12 mm Gems

1.55 ct Purple Spinel, 6.6 x 6.2 mm Cushion Cut From Tanzania

7.91 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gem, 14.1 x 10.1 mm

1.01 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.2 x 4.1 mm

2.13 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.9 x 6 mm

14.27 ct Black Spinel, 12 mm Round Rose Cut From Thailand

25.19 carat Pear Peanut Wood, loose Certified Peanut Wood from Australia, Natural Untreated Gem, 31.7 x 21.5 mm

12.25 ct Octagon Cut Smoky Quartz, 13.8 x 13.7 mm From Brazil

3.58 ct Round Checkerboard Smoky Quartz, 8.1 mm From Brazil

1.55 carat Round Ruby, loose Certified Ruby from Myanmar, Natural Gem, 6.3 mm

1.58 carat Orange Hessonite Garnet, Cushion loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 6.1 x 6.1 mm

0.58 ct Loose Orange Sapphire, 5.7 x 4 mm Oval Cut From Tanzania

2.58 carat Yellow Citrine, Emerald Cut loose Citrine from Brazil, Natural Untreated Gems, 8.1 x 6.1 mm

0.4 carat Oval Emerald, loose Certified Emerald from Colombia, Natural Gem, 5.9 x 4.1 mm

22.71 ct Heart Hematite, 20.3 x 19.1 mm From Brazil

1.98 carat Orange Hessonite Garnet, Oval loose Hessonite Garnet from Madagascar, Natural Untreated Gem, 8.3 x 7 mm

0.93 carat Yellow Citrine, Marquise Cut loose Citrine from Brazil, Natural Untreated Gems, 8.2 x 4.1 mm

1.25 ct Loose Orange Sapphire, 6.4 x 4.5 mm Oval Cut From Madagascar

22.73 ct Oval Pietersite, 30.2 x 22.3 mm From Namibia

19.75 carat Ammolite, loose Certified Ammolite from Canada, Natural Gem, 23.6 x 18.3 mm

30.63 carat Pear Hematite, loose Certified Hematite from Brazil, Natural Untreated Gem, 23.5 x 15.4 mm

1.59 ct Blue Kyanite, 6.3 x 4.2 mm Oval Cut From Nepal

5.21 ct Round Concave Cut Smoky Quartz, 12.1 mm From Brazil

0.74 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 5.8 x 4 mm

6.64 carat Black Tourmaline, Oval loose Tourmaline from Mozambique, Natural Untreated Gem, 12.8 x 10.5 mm

1.61 carat Orange Zircon, Emerald Cut loose Zircon from Tanzania, Natural Untreated Gem, 7.2 x 5 mm

1.27 ct Purple Spinel, 6.3 x 6.1 mm Cushion Cut From Tanzania

1.84 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.9 x 6 mm

2.38 ct Oval Strawberry Quartz, 9.1 x 7.2 mm From Russia

18.46 ct Marquise Rainbow Moonstone, 26.9 x 11.2 mm From the United States

9.41 ct Diamond Cut Smoky Quartz, 14.1 mm From Brazil

2.58 ct Oval Cut Strawberry Quartz, 8.1 x 6.2 mm From Russia

1.57 carat Marquise Cut Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 11.8 x 5.9 mm

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