that's gorgeous. One of my uncles turned his wife's wedding ring from a silver quarter. He cut it to rough shape, leaving more "meat" on it than you'd normally do. Then, he slipped it onto a hardened steel bar and hammered it down to flatten / widen it. Then, back to the lathe for final sizing, dressing, and polish.
It was born out of necessity - still an apprentice without much money and saving pennies for their house. It was really a nice ring. I always thought it would be neat if more spouses made each other's rings (i made my wife's - no lathe work though).
That's quite an heirloom.
paulh