Turquoise is often treated in various ways to enhance its appearance. This quick guide to the terminology used to describe those enhancements will help you make a smart buying decision when purchasing turquoise cabochons, beads or loose stones.
Untreated, chemically or otherwise.
Electrochemically treated to improve color; no resins or dyes are used.
Resin added to darken and harden; less brittle than natural or enhanced turquoise.