An ultrasonic jewelry cleaner is a device that uses an ultrasound and cleaning solution to get rid of grease and grime off jewelry. Depending on the size of the ornament, the time taken for the entire process ranges from 3 - 6 minutes, to about 20 minutes.
Sharper Image Design's cleaner does not need anything, other than water and a little bit of ammonia for cleaning. It claims to clean the jewelry off soap residues, grease, grime, dust, and dirt.
The jewelry cleaner from Hammacher Schlemmer uses 42,000 Hz of ultrasonic sound waves and water (detergent is optional) for deep penetration into crevices. This leads to safe and effective cleaning of intricate areas of bracelets, rings, and earrings. This product has a crystal clear LED screen with a digital timer, watch holder, and an easily accessible 18-ounce water reservoir.
The Compact Ultrasonic Jewelry Cleaner uses 42,000Hz of energy for cleaning the jewelry. It also cleans watches, eyeglasses, razor heads, printer heads, fountain pens, antique coins, badges, small silverware, etc.
Haier's HU380S key features include digital LED display with 5 preset cycles, auto shut-off, 20.3 oz. capacity, clear cover, and stainless steel cleaning chamber. Tap water can be used for this cleaner. Along with jewelry it cleans eyeglasses as well.
All in all, you will need to know your jewelry in and out and a bit about how these jewelry cleaners work to find the best model for your needs. Avoid using strong cleaning agents to get rid of dirt and grease from your delicate jewelry.