Diamond is not only harder than any other natural gem, it’s also
a lot harder than any natural or manufactural simulant. Diamond’s exceptional
hardness makes it possible to achieve very sharp facet junctions and superior polish.
A simulant’s comparative softness means that its facet junctions
always appear more rounded than a diamond’s. And most simulants quickly show
signs of wear, with scratches and visible abrasions.
Diamond’s capacity for a superior polish gives it much
higher luster than a simulant. Even a new, well-polished simulant can’t equal
the luster of a clean diamond in good condition.
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