Are there any non-ICR sources that say there is carbon 14 in diamonds?

If it's true, then it doesn't refute evolution any more than anyman's dishonest claim that C14 in fossil beds is a disproof of evolution.

http://www.talkorigins.org/faqs/c14.html

Consider this:
1) Just because MOST C14 is formed in the atmosphere doesn't mean ALL of it is.
2) Some places we find diamonds are also the places we find uranium.

However, I have to thank you for bringing this up. Typical dishonest creationists use that tactic often. Find some arcane fact, do ABSOLUTELY no research on it, claim it ABSOLUTELY refutes evolution, and then cackle as if you've said something intelligent when you've really just proved yet again that you're intellectually lazy.