I have platinum and daimonds, too. I clean mine at home, no prob. I use a soft toothbrush and windex multi-purpose spray at home once a week. I've never heard that you lose a little platinum with a jeweler doing the cleaning. Maybe they were talking about jewelry that's just platinum dipped? It's usually a mild cleanser in a sonic cleaner, or the steam cleaner at my jeweler. I watched Martha Stewart do it on t.v. She used ammonia and water bath, soaked it then used a toothbrush under running warm water. Whatever you do be sure you put the stopper in the sink before you rinse it!