leonid:
Please don't call me an expert. An expert knows all the answers. I know some of the answers.
An EXPERT: An Ex is a hasbeen. A spert is a drip under pressure.
Somebody told me this about 15 minutes before I gave my first public talk back in the early 70's.
I do enjoy gemology and I don't mind jumping in when I can contribute something useful, hopefully.
diamondmanbob