1 carat = 200 milligrams
1/2 carat = 100 milligrams
One half carat diamond weighs around 100 milligrams.
This indicator means that if all the diamonds in the ring were removed, their combined carat total weight, would be equal to one-half a carat.
The descriptor '.45' usually documents the carat weight of a diamond: meaning 45/100ths of a carat, or nearly half a carat.
If you mean 1/4 carat, that is one quarter of a carat or 25 points (one carat = 100 points) .
Generally, you would write .50 carat to represent a half-carat stone.
A carat is a unit of weight used for gemstones. One third carat is the weight of the diamond.
Total carat weight which the sum of the individual carat weights of all the diamonds in a piece of jewelry. One carat is divided into 100 parts, called points, so, a 25-point diamond weighs a quarter carat and a 50-point diamond weighs a half carat
Your question implies that the number is less than one full carat, so you could also write it as .59 carat -- rounding up, meaning that the stone weighs just over half a carat.
Half a carat is .50, and a quarter of a carat is .25, therefore 3/8ths of a carat is .375
One carat is equal to 0.2 grams, so one and a half carats is equal to 0.3 grams.
half = 1/2 = 0.5 = 0.50 < 0.58 → Yes.
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.