The weight by which precious stones and pearls are weighed., A twenty-fourth part; -- a term used in estimating the proportionate fineness of gold.
100 per cent gold is the meaning of 24 carat gold.
Carat
The descriptor '.45' usually documents the carat weight of a diamond: meaning 45/100ths of a carat, or nearly half a 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.
0.25 means its the carat of diamond,meaning you have quarter of carat real diamond
Your question is not clear. Is it referring to Diamond carat or Gold karat. This is because both have different meaning. While, Carat refers to weight of diamond (or gemstones), Karat refers to purity of gold. Check the link.
It means the amount of gold.
A carat, in relation to diamonds, is a unite of mass that is equal to 0.2 grams. Meaning a 4 carat diamond weighs just over .8 grams and an 8 carat diamond is 1.6 grams.
Carats in diamond weight can be divided into 100ths, meaning that a quarter carat stone could be described as a .25 carat diamond. In your case, you could describe this stone, as just over half a carat or .58 carat diamond. Less than full carat stones are also called points: a 58 point stone in your case.
It's probably 375 meaning it's 9 carat gold
This is just the jewellers mark, it doesn't have any affect on the value of the gold. The numbers which have meaning and affect the value are: - 333 (8 carat / 33.3% gold content) - 375 (9 carat / 3.75% gold content) - 417 (10 carat / 4.17% gold content) - 585 (14 carat / 5.85% gold content) - 620 (14.8 carat / 62% gold content) - 750 (18 carat / 75% gold content) - 800 (19.2 carat / 80% gold content) - 875 (21 carat / 87.5% gold content) - 915 (22 carat / 91.5% gold content) - 990 (24 carat / 99% gold content) - 999 (24 carat / 99.9% gold content) The most common gold content used in modern jewellery is 3.75% (9 carat).
22 carat gold refers to gold that is made up of 91.67% pure gold mixed with other metals such as copper or silver. It is commonly used for making jewellery due to its durability and shine. The higher the carat of gold, the purer it is.