Well, here I set with egg upon my face . You’re right … and
this points out why I should not post to newsgroups late at night …
sigh … I went back and checked my notes … the fluorescence I
noted was in synthetic CARBORUNDUM not QUARTZ … duh!
This came up when I encountered a rough dealer with a table full of
"river tumbled sapphire rough" that was suspiciously homogenous in
color and hue … not to mention priced well below market price.
Looks like they have taken to smashing up synthetic boules and tumble
polishing the chunks to simulate natural gravel. What is real cute is
how their English comprehension is inversely proportional to the
depth of questioning. This particular fellow would not admit the
rough was synthetic, but he became less than comprehensible when I
wanted written documentation of origin and source. 'Nuff said!
BTW, even that is not completely reliable of late … I did a quick
check on some boules I received from Morion and of 6 splits, the
white (clear) and light pink do not fluoresce (1 each) …
Back to the microscope and yep … very careful inclusion
examination … what is particularly frustrating is most amethyst is
not particularly high priced relative to other colored gemstones …
where do you give up? Paying GIA inspection fees that can approach
half or more of the stones value sure isn’t a good answer.