Check also if the girdle seems too thick. The Crown & Kite facets must be in exact proportions all around the stone. If any of these strange occur this is a Red Flag, your stone is not a diamond... Another point is to invert the stone.. If it looks transparent, another Red Flag! It isn't what it seems, just a synthetic CZ!!!..;(
Gerry Lewy!...just sent from my very busy iPhone!