unit of measurement used is the “point”. A point
is one hundredth of a carat. 100 points = 1 carat. For example
you could describe the weight of a diamond as 0.50 carats or
as .50 points.
A 5 carat stone for example is worth more than five 1 carat stones that are
otherwise of the same quality.
In order to weigh diamonds, we use very accurate weighing scales. Scales used
to measure diamonds are so sensitive that the weighing pan is sometimes inside
a glass case so that the reading won't be affected by any draughts in the room.
is the hardest known natural substance. This
hardness is exhibited in its resistance to scratching and the ability
to scratch other materials. Steel and glass, for instance, can
be scratched by diamond. The
Mohs hardness scale was devised by the German mineralogist Friedrich
Mohs and indicates the relative hardness of substances on a rating
scale from 1 to 10 – diamond being assigned a value of 10.