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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (0): Octagon Shape 27 x 20 mm Gems Clear All
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Octagon Shape 27 x 20 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 27 x 20 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.

Certified Customer Reviews
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Happy about the experience of the store, a lot of stone urge very nice
Posted By Ginger22 in April, 2018
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Great products, reasonably priced, always a great shopping experience
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good all is very good
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Ease of selection- guarantee- honesty
Posted By Curt in April, 2018
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when I need a colored stone I check gem select. a trusted supplier for at least 10 years for me. many of the online sites have gone black but gemselect continues to satisfy me. oh sure there are many windowed and poorly cut stones here so paying some attention is critical. remember these are not custom cut stones but rather cut by old methods and the aim is to keep weight up at the expense of optical perfection. remember that colored stones are about color as the first consideration. I just wish gemselect offered rough for those who want to cut it.
Posted By Bis in April, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Wow, great site with clear, concise information that is provided in a very user-friendly interface. I feel lucky to have found this given I am about ready to ask my dream girl to marry me. Thanks!
Posted By JJ in April, 2018
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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

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