Hi, all First of all, thank you all very much for your excellent
replies to my question about my friend’s discolored (due to heat)
emerald. I pased them all on to her, and she also thanks you.
Several of you asked me to let you know about the outcome.
Well, it turns out that aparently the emerald was not damaged. I
don’t know whether it was just some kind of a surface coating (from
the gunk she had it in, or just plain dirt), or what. but she said
that after she had cleaned it up from the solder job she looked at the
underside of the emerald and it looked OK. So she stuck it in her
ultrasonic cleaner, and it came out looking very good!