Here is my problem. A customer sent in some old jewelry to be
reworked.
One ring had about 20 little 2 mm round stones that two of my
employees both tested as diamonds. Another employee took the shortcut
of melting the ring to remove the stones. (We do this quite often,
usually for material we are scrapping out.) So the stones turned
various shades of yellow and tea-orange. Actually quite attractive
colors. But they don’t test as diamonds anymore. The tester we use is
a Gemoro Ultra-tester II.
Obviously I have to tell my customer what happened. It would be
useful, and make me seem not quite so stupid, if I had some idea what
material would fool the diamond tester and also turn yellow with
heat.
Any ideas?
Steve