A diamond is valued according to its cut, colour, clarity and carat weight. A local jeweler can answer your question given a precise example.
A one-half carat diamond weighs 100 milligrams = 0.10 gram.
Generally, you would write .50 carat to represent a half-carat stone.
Half a carat is .50, and a quarter of a carat is .25, therefore 3/8ths of a carat is .375
half = 1/2 = 0.5 = 0.50 < 0.58 → Yes.
1 carat = 200 milligrams 1/2 carat = 100 milligrams
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. A local jeweler can give you the answer you want.
You can buy a diamond of about this carat weight today on Blue Nile and pay between US$4,846 and US$60,820, depending on the cut, its quality, clarity, colour and exact carat weight that you want.
1 carat is 0.2g, so 1/2 of a carat equates to a 0.1g gemstone.
The descriptor '.45' usually documents the carat weight of a diamond: meaning 45/100ths of a carat, or nearly half a carat.
One carat weight of diamond weighs .20 grammes, so your diamond is about half that weight, or roughly half a carat.
A carat is much greater.
22 carat