Ultrasonic cleaning

A device for cleaning dirt and other foreign particles from gemstones and jewelry articles by subjecting them to ultrasonic vibrations immersed in water or other solvent. The articles must be free of stress flaws. Glass lenses and other bodies can be polished by this method. An ultrasonic bath consisting of a piezoelectric transducer and a container for fluids, which works at frequencies in range of 50,000 to 100,000 Hz. Beyond the limits of hearing of the human ear.