Diffusion is easy to detect if the stone is loose, and can be
detected if the mounting is open in the back. There are also very
specific inclusions that are created after the diffusion process.
i believe that color concentrations observable when a stone is
immersed and color “bleeding” in fractures are diagnostic of
diffusion that is restricted to the surface of the stone, as with
titanium, but not to diffusion that penetrates throughout the stone
as is often the case with beryllium.
Contrary to some of the popular opinion, there are, in fact, some
very strong indicators available in many stones.
it’s the stones that lack very strong indicators that concern me–it
seems logical to me that if some stones lack indicators detectable
with “small-lab” equipment (scope, liquids, etc.), then, in
principle, it’s not possible for small-lab gemologist/appraisers to
consistently separate “normal” thermal-enhancement from beryllium
my understanding is that virtually all colors are being produced by
beryllium diffusion so how can an appraiser assign a value to ANY
corundum of ANY color when the stone may, in fact, be
"…artificially colored with beryllium"?
what i would really like is someone to say: "we have an inexpensive
protocol or instrument that separates all diffusion treated corundum
from thermally-enhanced corundum and this protocol/instrument is
available to those of us who don’t have the finances and expertise
of GIA or AGTA.
until such a protocol or instrument is in common usage, i have to
ask: how do you, as an appraiser, establish value for corundum,
given that you are unable to conclusively separate thermally-enhanced
corundum from beryllium diffused corundum?