Shipping coins to other countries

[foinikas]

Everytime i go to the post office to ship a coin to EU or UK or USA i have the same problem. Either by normal post or UPS or DHL or FedEx, they all basically prohibit sending precious metals or bullion and generally coins so unless you write that your package contains something else you run the risk of your package not being accepted.

A silver coin of smaller value can be send registered but not insured as the risk and value is less, but what happens with something of great value? 
i am wondering how everyone else can send their coins safely and secure around the world,  especially coins of big value.