Calibrated Size for Octagon Cut Gemstones 16x12 mm

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 16 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 16x12 mm Gems

0.33 carat Emerald Cut Emerald, loose Certified Emerald from Colombia, Natural Gem, 4 x 3.9 mm

3.12 carat Oval Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 7.9 x 6 mm

1.02 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.3 x 6.2 mm

1.43 carat Oval Ruby, loose Certified Ruby from Madagascar, Natural Gem, 7.2 x 5.3 mm

23.05 ct Heart Hematite, 20.3 x 19.1 mm From Brazil

20.13 ct Oval Nuummite, 21.1 x 14.9 mm From India

8.48 ct Carved Prehnite, 16.4 x 10.6 mm From South Africa

2.15 ct Baguette Labradorite, 8.1 x 6.2 mm From Madagascar

6.52 ct Oval Strawberry Quartz, 10.1 x 8.1 mm From Russia

4.31 carat Yellow Citrine, Oval loose Citrine from Brazil, Natural Untreated Gems, 9.9 x 8 mm

1.7 carat Square Pyrope Garnet, loose Certified Pyrope Garnet from Mozambique, Natural Untreated Gems, 4.6 x 4.5 mm

1.75 ct Round Cut Strawberry Quartz, 8 mm From Russia

47.98 carat Yellow Quartz, Pear Checkerboard loose Quartz from Brazil, Natural Gem, 36.1 x 22.2 mm

4.64 ct Oval Rutile Quartz, 11.9 x 8.1 mm From India

14.39 ct Gray Star Sapphire, 13.5 x 12.3 mm Oval Cut From Myanmar

3.68 ct Yellow Quartz, 11 x 9 mm Oval Cut From Brazil

0.59 ct Loose Orange Sapphire, 5.9 x 3.9 mm Oval Cut From Tanzania

0.6 ct Loose Purple Sapphire, 7.7 x 4.4 mm Odd Shaped From Tanzania

1.32 carat Red Malaya Garnet, Marquise Cut loose Malaya Garnet from Tanzania, Natural Untreated Gem, 9.9 x 5 mm

2.66 carat Pink Tourmaline, Emerald Cut loose Tourmaline from Tanzania, Natural Untreated Gem, 9.9 x 6.4 mm

1.05 carat Yellow Citrine, Square loose Citrine from Brazil, Natural Untreated Gem, 6.1 x 6 mm

28.12 ct Green Jadeite, 40.5 x 14.7 mm Carved From Myanmar

24.4 ct Pencil Cut Jasper, 32.1 mm From India

3.41 ct Green Apatite, 8.9 x 8.9 mm Asscher Cut From Madagascar

0.06 ct Blue Diamond, 2.4 mm Diamond Cut From India

0.47 carat Violet Sapphire, Pear Shape loose Sapphire from Tanzania, Natural Gem, 5.5 x 4.2 mm

1.21 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.9 x 6.9 mm

15.85 carat Cushion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gem, 20 x 15.1 mm

27.07 ct Cushion Jasper, 21.2 x 15.4 mm From Indonesia

2.81 carat Trillion Amethyst, loose Certified Amethyst from Brazil, Natural Untreated Gems, 7 x 6.2 mm

1.11 ct Marquise Cut Peridot, 8.1 x 4.2 mm From China

3.17 carat Orange Hessonite Garnet, Emerald Cut loose Hessonite Garnet from Madagascar, Natural Untreated Gems, 5.9 x 5.9 mm

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