This comes from my friend Jamie S. from Houston, TX:
"The BEST way to clean jewelry tarnish/silver service is with a toothbrush and toothpaste! The toothpaste isn't abrasive or harsh on the surface. A soft toothbrush won't leave scratches! (or for silver service you can use a soft cloth!) I used to work in retail, and we cleaned our jewelry with a jewelry cleaner. It left the jewelry sticky and stinky, and it would tarnish fast and eventually, it wouldn't get clean after being treated. We started using the toothpaste/toothbrush method, and it worked! Even if you don't have tarnish, it still helps to get that shine back!"
I told her I do this but didn't think it was a "tip" because I thought everyone did. Guess not :)
Also make sure to get those toothbrush bristles under the diamonds with the toothpaste and rinse well for a super clean shine.