To clean sterling silver pieces, use a silver cleaning cloth or a cleaning agent that has a sulfur base. If the surface becomes scratched, take your jewelry to a professional jeweler for polishing. If possible, store in an anti-tarnishing bag. To clean, soak diamond jewelry in an ammonia-based household cleaner and brush with a soft, clean toothbrush. Never use harmful, abrasive solutions or chlorine. Keep diamond pieces separate from other jewelry to avoid scratching. Soft bags or tissue paper are best. Consider having pieces inspected regularly to make sure the settings are secure.