Gold pendant & silver color necklace?

If you like it, rock it!

Personally, I like to mix metals so I have no problem with it. Right now I have a jade pendant with a white gold bail but I don't have a long chain to match it, so it goes on a yellow gold chain. My favorite necklace is a Tiffany ladybug that has a platinum body and yellow gold antennas on a yellow gold chain.
 
While I think it depends on the charm and chain, I think mixing metals is absolutely acceptable!
I used to take such issue with it, but now it's pretty much all I do. Rock it!
 
I agree with the other replies. I think it depends on the pendant and the chain. I love mixing metals too. I wear a Tiffany rose gold mini open heart on a platinum chain and I love it! I would love to see a picture of your pendant and chain xx