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. Clean gold jewelry regularly using sudsy, lukewarm water or by bringing it to a local jeweler. When exposed to dust, moisture, perspiration and makeup, gold can lose its luster. Keep gold jewelry away from chemicals, especially chlorine. Store away from other metals, wrapped in a soft cloth.