(~s)
1.
A ~ is a unit for measuring the weight of diamonds and other precious stones. It is equal to 0.2 grams.
The gemstone is 28.6 millimetres high and weighs 139.43 ~s.
...a huge eight-~ diamond.
N-COUNT: usu num N
2.
Carat is used after a number to indicate how pure gold is. The purest gold is 24-~ gold.
...a 14-~ gold fountain pen.
COMB in ADJ