Polonium has a very short half life, so it's very, very scarce. 

Palladium is about half the price of gold, but my high school class ring is an alloy of silver and palladium that doesn't tarnish, and it wasn't much more than silver at that time, so it must be present in a small amount...  I did some Googling an there is such an alloy that is 3% palladium and 97% silver...

http://www.jckonline.com/2012/08/26/pinch-platinum-could-be-just-what-your-silver-jewelry-needs

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