Can you take a broach on a plane?

Yes u can

Well your luggage will go in the baggage section on the plane , you can take a carry on that weighs 15 pounds or less on a flight any where in the U S. On an international flight you can take 2 suit...

you can take anything you like on planes apart from the following things: Fireworks flares grenades areosol cans gasoline lighter fluid lighters gunpowder matches paint And anything else...

you would have to take them as part of normal luggage.

look here http://www.tsa.gov/travelers/airtravel/prohibited/permitted-prohibited-items.shtm