I will go to USA by plane, but I want to bring my golden & jewelry. Its safe for me to bring it or not?

You can take it, but I'd recommend putting it in your carry on bag instead of your normal luggage. While most baggage handlers are nice honest, decent well meaning people, there are always a few rotten apples, right? Also, in your normal luggage, it will be stored below the seats, and that is not the best area for valuables. Things get smashed against one another and tend to break. Don't wear it either, or else you'll have to take most of it off to go through the metal detector. I recommend just placing it in your carry on bag. It's highly unlikely that they'll try to take it, even if they do ask a second look at it and you'll be able to keep your eyes on it at all times.