Hey I was wondering, I have this sterling silver ring that is flat on top and has my initial on it and I wanted to give it to my girlfriend for and engagement ring, how ever it doesn’t have a diamond on it so I was just curious if you could dip or coat a ring u already have. For instance, my sterling silver ring in white gold and place a diamond on it? If so would it cost more to do that or just to buy a ring? If some one could help me out with this that would be great.