Carat weight is the easiest of the four C's to determine,
however the diamond MUST be loose. Too many jewellers approximate
carat weight, for instance, when you buy a 1/2 carat diamond, which
you assume to be 50 points, you may actually be getting less than
that. Many stores sell as low as 45 points, and present the stone
as "approximately" a 1/2 carat.
There is nothing wrong with buying a "light" 1/2 carat,
however the cost should be significantly less. You should know what
you are buying, and pay accordingly.
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