i want to know how worth is this rare coin ?

Hello, Isam --

I'm afraid this coin is unfamiliar to me and therefore I don't know what exactly you have here. This site mainly deals with United States coins, and this piece seems to fall outside my realm of expertise. Perhaps you will have some luck in posting this coin on another forum that handles world coins?

Best wishes,
Josh

Yeah, I'm interested too. Did you find answer?

The coin in question is a Ludovico coin from 15th-century Milan. An authentic gold specimen is probably worth thousands of dollars depending on condition.

However, the specimen in the images looks to be a copy made for jewelry. Authentic renaissance pieces are nearly impossible to find in such good condition. The minting also looks too precise for it to have originated in 15th-century Italy.

If you want to be sure you could take it to an ancient coin specialist.