Dust and dirt can get trapped in the tiny grooves of diamond jewelry. Even though diamonds are the strongest metal, small dust particles can create imperfections and, over time, could cause these gems to discolor and lose their luster.
Jewelers recommend that a diamond be brought in for a cleaning every six months, but try this at home before running out to the store. Apply toothpaste to an old toothbrush. Use this to scrub the diamond gently, rinse, and then dry. Toothpaste has a soft texture and is mild enough to clean any diamond without tarnishing it.