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ULTRASONIC CLEANER
A machine that cleans jewelry by using a fluid that is vibrated at 20,000 cycles per second. When the vibration speed rises above the ultrasonic frequency level, bubbles explode and generate strong power, cleaning the surfaces and cavities of hard-to-clean objects. Ultrasonic cleaning does not scratch the surface or harm objects like many chemical or abrasive cleansers.

UNAKITE
Unakite is an opaque mineral that is green with patches of red and pink. Unakite is a variety of granite that contains green epidote and pink feldspar (but lacks mica). It has a hardness of 6 to 7 and a specific gravity of 2.86 - 3.2. Unakite was named for the Unaka Mountains Mountains in Tennessee, USA. Unakite is found in the USA and Africa.

UREA BAKELITE
Urea bakelite is a type of thermoset plastic.

UVAROVITE
An emerald green garnet composed of chromium lime. Named from the Russian Count Uvaroff. Uvarovite is almost never used as a gemstone. Distinguishing Uvarovite and Tsavorite is difficult, but an experienced gemologist can do it.


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