Hi Alan,
by rock crystal do you mean good quality clear quartz crystal. My second question is if intan is the cut not the stone, what stones would qualify as intan in the sense of intan as applied to a keris handle or sheath. You have said that rose cut rock crystal is yakut so presumably intan would have to be relatively colorless and harder than rock crystal....diamond, white sapphire and topaz would be my guesses.
regards
David
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