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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (6): Octagon Shape 14x12 mm Gems Clear All
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ID: 4014291 pcs
thumb image of 10.3ct Octagon Facet Brown Smoky Quartz (ID: 401429)
10.25ct Smoky Quartz
13.55 x 11.96 x 9.64mm
USD 25.62
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ID: 4347401 pcs
thumb image of 13.6ct Octagon Facet Bi-Color Ametrine (ID: 434740)
13.61ct Ametrine
14.17 x 11.95 x 9.49mm
USD 81.66
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ID: 4358771 pcs
thumb image of 10.5ct Octagon Facet Bi-Color Ametrine (ID: 435877)
10.50ct Ametrine
13.46 x 11.74 x 8.60mm
USD 52.50
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ID: 4332031 pcs
thumb image of 9.8ct Asscher Cut Brown Smoky Quartz (ID: 433203)
9.84ct Smoky Quartz
13.46 x 11.56 x 9.55mm
USD 16.73
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ID: 3696481 pcs
thumb image of 6.6ct Octagon Facet Orange Fire Opal (ID: 369648)
6.62ct Fire Opal
13.48 x 11.69 x 7.28mm
USD 214.69
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ID: 3989581 pcs
thumb image of 10ct Octagon Facet White Quartz (ID: 398958)
9.97ct Quartz
13.96 x 12.20 x 8.47mm
USD 15.85
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Octagon Shape 14x12 mm Gems
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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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart