Home devices, like the bestselling Magnasonic Professional Ultrasonic Jewelry Cleaner, are available online for under $50.

Know the news with the 7NEWS app: Download today So what did he recommend? An ultrasonic cleaner you can purchase off Amazon. It cleans precious metals and other items with ultrasonic frequency, so ...

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Only use jewelry cleaners labeled as safe for pearls. Never steam clean pearls or use an ultrasonic cleaner, and avoid exposing pearls to detergents, bleaches, baking soda, or ammonia-based cleaners.

Do not use an ultrasonic cleaner or steamer. Avoid sudden temperature changes, steaming and contact with cosmetics, hair spray, perfume and household chemicals. Clean with a damp cloth or soft brush.