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Monday, 29 October 2007

reflectivity meter. An electronic de­vice for measuring the relative ability of a surface to reflect radiant energy. Relative reflectivity depends on R.I., flatness, quality of polish, and the cleanness of the surface. Since reflec­tivity meters are not limited by the 1.81 maximum reading on a conven­tional refractometer, they are useful for stones above this limit. Results are not always repeatable or accu­rate. Reflectivity meters do not mea­sure birefringence. The "Gemeter," "jeweler's Eye," and the "Re-dex" are reflectivity meters presently avail­able.

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