We have had the most drastic problems with the treated
chalcedony. I've seen some turn very pale within a few weeks of
them being in the window.
As I stated in the previous post, the heat from being in the window
is what's causing your problem.
I have even asked myself at the stone dealers that I have been
doing business with for years if these stones will fade, or what
process was done to them to make them that color. Shish! Every
employee has given me a different answer and not one has said that
it will fade! I don't trust all this "heat-treating" but it seems
like the majority of stuff out there is heat-treated. How do you
protect yourself and your reputation against it?
First, contact GIA and order a copy of their Gem Reference Guide. It
lists all popular their properties, the most common
treatments, the stability of those treatments and what affects them.
Second, enroll in a gemology course. Yeah, I know, every time I say
this, the most common response is "I can't afford it" or "No way do
I have the time for that, it'll have to stay a hobby for now" but
these are the same people who call themselves jewelers. Even the
ones who don't call themselves jewelers, but simply want to buy gems
for their jewelry creations want some kind of magical way to avoid
knowing the subject. It seems everyone wants some kind of global
"Gemstone Police" to have all the knowledge and experience for them
so they can be protected against having to actually know their own
I've said it before, but it bears repeating: "I sure am glad I
picked the doctor who actually studied anatomy." Be the jeweler who
James S. Duncan, G.G.
James in SoFl