Used once on a gold ring I recently had rhodium plated. Left the diamonds nice and sparkly for sure -- but the tinge of yellow now shining thru wherever the brush touched my (formerly) white gold ring is not so great. Not sure if this is the fault of the cleaner or a problem with the jeweler's plating process, but this was one VERY expensive home cleaning job! If your ring is rhodium plated (as most all modern white gold is), it might be a good idea to test this product in an inconspicuous place -- if there is such a place on a ring.