Joined: Fri Feb 24, 2006 1:20 am Posts: 2627 Location: Southern California, U.S.A.
Without seeing and testing the stone it's hard to guess. The most dispersive man-made stone I've ever seen is synthetic rutile which was marketed years ago as Titania. I know the Russians are making it, and doping it to green (or another) body color proably wouldn't be a big trick.
Other high-dispersion diamond simulants available from Russian labs include strontium titanite, as mentioned; lithium niobate ("linobate,") and lithium tantalite. YAG also could be a candidate, and it's already available in several colors.
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