Won bracelet & earrings while on board Edge

[DragonflyCruiser]

After we booked our next cruise there was a drawing for a bracelet and earrings.  I'm not sure what it's made of or how to clean it?  Anyone have any ideas?  The bracelet looking like a tennis bracelet and could pass for diamonds.  It's not!  Wasn't sure if it is silver or something else.

[mom says]

Take it to a jeweler. They can tell you.