The
skill with which a stone is cut should be taken into consideration in
valuing it, although this is a matter upon which only an expert is
competent to give an opinion. Of two stones of the same weight and
equal quality, one may be worth ten times as much as the other because
more skilfully cut. Further, the exact qualities desirable in any
particular gem are points to be learned by long skill and experience,
and stones possessing these qualities command much higher prices than
the ordinary.