Cheap Fake Gold Rings
If you are waiting in line to see Christ Redentor and some woman carrying a baby or a kid offer you a ring and tell you that she found it and want some money to feed her kid. Just reject that deal if it looks a really good one. These rings are made of cheap metals and don't value more than a couple of cents. Make sure you don't old the ring just ignore the person and enjoy your staying in Brasil.