There are any number of gemologists on Orchid who would be able to do
that for a fee.
I also can recommend Charles Carmona at Guild labs in L.A.
Unfortunately you will OFTEN find that a ‘mixed bag’ of ‘semiprecious
stones,’ has MUCH junk, synthetics, and glass. Frequently not worth
the expense of testing. HOWEVER, all you need is one diamond or a
fine genuine Alexandrite, and you’re in hog heaven.
Lord of the Rings
607 S Hill St Ste 850
Los Angeles, CA 90014-1718