The researchers recorded the spectrum emitted by a
10-micrometre-wide point on each stone's surface and found
that every one, even those of the same type, had a different
spectrum. The differences were particularly marked in the
ultraviolet range. "That could be your fingerprint," says
Martin, who presented his results at the American Academy of
Forensic Sciences meeting in New Orleans, US, last month.
The above mentioned article/technique is interesting & bears more
study. However, it may be a little too early to expect it stand up
The area in question is quite small, 1 preceded by 12 0's, sq.
meters. Who's to say that all the ingredients in the stone are
equally distributed so that the stone would test the same at all
locations? Or if the stone were tested more than once that the same
spot was tested?
As a participant (who's familiar with the process & uses it
regularly) in another group said, 'It's like describing the forest
when all you've done is put your nose against the bark of one tree.'
If the process is truly worth it's salt, I expect there'll be more
research done & an article or two in Gems & Gemology in the future.