Hi, I inherited this diamond and platinum ring from my great aunt and gave it to my girlfriend a number of years ago. It's now too tight on her finger, starting to cut off circulation, and I'm looking into having it enlarged for her. I've done quite a bit of reading but am confused as to whether it's safe for the ring, or even possible to resize a ring like this. Before heading to a jewelry store I wanted to at least know a little bit about the subject, so any thoughts would be helpful. Than k you.