This is going to be a really dumb question but, my mom died 7 years ago and I still have her jewelry box. In it were a bunch of random things, earrings, necklaces, etc. A few thinks I've looked and have seen where it says "10K" etc. so I know it's gold. But what about earrings that are gold looking but no numbers like that on it? Should I assume that means it's just the cheap stuff they sell that's not real gold? Or should I just take it all and see?