There is no single cleaning method that suits every metal, finish, stone and adhesive. Start with the instructions supplied with each piece.
Separate delicate surfaces
Store items so chains do not tangle and harder pieces do not rub against softer ones. A divided box or individual soft pouch can help organize a collection.
Check before cleaning
Do not assume a household cleaner, ultrasonic device or soaking method is suitable. Plated finishes, porous stones and bonded components may require specific treatment.
Inspect fastenings occasionally, and stop wearing a piece if a clasp or setting seems loose. A qualified jeweler can advise on repairs and material-specific care.