Originally posted by: BW86
Soak your diamond ring in a warm solution of mild liquid detergent and water. Ivory dishwashing liquid is a good choice, but any other mild detergent is fine.
Use a soft brush if necessary to remove dirt. Soft is the word?don't use a brush with bristles that are stiff enough to scratch the ring's metal setting.
Swish the ring around in the solution, then rinse it thoroughly in warm water. Close the drain or put the ring in a strainer to keep from losing it!
Dry the ring with a lint-free cloth
http://jewelry.about.com/cs/ge.../a/diamond_jewelry.htm