Your diamond ring will sparkle like the day you got them with the right cleaning technique. Here's the safe way that jewelers recommend.
Mix a few drops of Lemon Glow Dish Soap in warm water. Soak the diamond ring for 20-30 minutes.
Use a very soft toothbrush to gently brush around and under the diamond, where dirt and lotion accumulate and block sparkle.
Rinse under warm water. Work over a bowl with a strainer so you don't lose the ring down the drain.
Pat dry with a lint-free cloth. The diamond should immediately sparkle more as clean facets reflect light properly.