1 carat is 0.2g, so 1/2 of a carat equates to a 0.1g gemstone.
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Forty points is equal to 40/100s or 4/10s of a carat -- almost half a carat.
It means that the total carat weight (t ct w) of both earrings together is 1 carat. In other words each stud will be half a carat.
half = 1/2 = 0.5 = 0.50 < 0.58 → Yes.
500 grams
One U.S. nickel weighs 5 grams, so one-tenth of a nickel would equal 0.5 grams.