How much does a jeweler pay for an 18-karat yellow gold ring

For example a 2gr 18k simple gold wedding ring cost 400$, the jeweler buys the raw gold to make this ring with 100$ 1gr. After that he melts it, shapes it, and works with it to give it the shape of a ring. In the end, one 1gr of 18k gold comes to 200$ cost to buy newly formed. If you are selling your ring after wearing it (some stores have a policy in place: the bigger the wear the lesser the pay) for some time, then the jeweler will pay you 50$ for 1gr of 18k gold, it's half the price it would take for him to buy “raw Gold “ and of course, there is always the chance that instead of melting your ring and doing something else with it, he could simply clean it and put it for sale at the price of a new like jewelry.