'Worth' is an adjective. 'Value' is a noun. How much is this ring worth? = What is the value of this ring? This ring is worth £1000 = The value of this ring is £1000. The meaning of these sentences is the same, but the grammar is different.

For example It is not worth it it to argue with my mother today about the loan. The value of the gold has dropped or alternatively the worth of the gold has dropped. It is a similar in meaning , how important is something.