Can you enlarge on your comments? What specifics are you speaking
I guess it should be said that I have no inside knowledge and what
follows is simply my contemplations of the issue.
The main tenet of the book that it is impossible to duplicate ALL the
features of a gemstone. So identification is possible by conducting
tests and comparing results with what is should be.
In some cases this is no longer true under commonly excepted
definition of “all the features”.
Take a padparadschah sapphire. In untreated stone the source of
color is combination of chromium and oxygen. But we also know that
the same coloration can be produced by berillium diffusion. If all
one have is this book (a lot of jewelers do), can one actually tell
(To anticipate some responses, berillium diffusion cannot be reliably
detected by submerging)
Theoretically yes. Spectrum of the gemstone should tell the story,
but the book mentions it somewhat implicitly.
Take another case of lab-grown amethyst versus natural. The book is
of no help at all. One must use crystallographic analysis to tell
them apart, but it barely mentioned in the book.
So “all the features” are still true, but definition of “all the
features” changing very, very fast
In my humble opinion, todays world requires deeper understanding of
microscopy and crystallography for gemstone identification. GIA
solution is to test with advanced equipment, which jewelers simply do
Up until now it was not emphasized enough that common tests are
becoming more and more limited in usefulness. But I suspect this is
about to change. That why the book have been withdrawn from the
circulation. I simply needs updating.