I got engaged a while back, and my gf and I went out and got some local guy to put a ring together. At the time, my gf wanted a small gem (~.6 ct). However, she's changed her mind and wants a larger one (~1 ct). So, I wanted to know what's the best way to unload the original sapphire (not diamond) from the engagement ring? I know diamonds lose value quickly, but do sapphires? Also, do I need an appraisal for a small gem (maybe .6 ct)? Thanks.