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Glossary - U
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- Ultrasonic Cleaner
- A device used to clean jewelry using ultrasonic waves to loosen dirt and build-up. There are several affordable models of ultrasonic cleaner designed for home use. You can find them available in small-appliance stores. There are certain gemstones which should never be cleaned with an ultrasonic cleaner.
- Uniformity
- A grade that describes how well pearls in a piece of jewelry match one another. Uniformity can be excellent, good, or fair.
