This past week, I did a cast-in-place sterling silver pendant with
three 2.5mm diamonds (color G, grade SI, matched, round brilliant). I
did NOT use debubblizer (see previous postings as to problems that
happened with that). Just did a straight casting - wax, stones,
investment. Burned out normally, cast into sterling silver, allowed
to air cool for a bit over an hour before digging it out of the
investment. Everything looked normal at that point, except one of the
diamonds was brown. I figured it was just still a bit warm, so
finished cleaning it up, put it in the ultra and then in the pickle.
2 hours later, the stone was STILL brown. It also looks like it has a
bit of a "metallic" glint to the surface - almost like an
The other two stones are fine.
Does anyone out there have a clue as to: 1. What happened? How to
prevent it happening in the future?
2. How can I fix it? Is there anything I can soak it in, heat it
with, etc., that might restore it to the original color?
Many thanks for any help!
And Happy Thanksgiving for all of your Orchidians in the U.S.!