The Skritter pronunciation for 钻 and 石 respectively are very good but for some reason 钻石 sounds like its spoken through a tin can with some radio interference at the same time :D

I am just wondering why this is happening?

Just the way Chinesepod must've recorded it... (The word sounds coming from there).

冰 is pretty crazy too

冰 just scared the hell out of me, making me search for this thread. could be an alarm clock.

I love 冰. Every time I hear it, I can't help but laugh.

I turned off the audio because of 冰.