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: Unfinished Cabochon Bottoms
Frequently Asked Questions (FAQ) / Unfinished Bottom on Cabochons

Why are many cabochons unfinished on the bottom?

Many opaque cabochons are mounted in jewelry in such a way that the base is not visible, thus the cutter opts not to polish the base. In fact if glue is used to set the cab, it is better if the base is not polished. Translucent or transparent cabs are usually polished on the base.

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  • First Published: February-20-2006
  • Last Updated: November-10-2014
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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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