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 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.
Uvarovite is a rare emerald-green Garnet. It is not used a faceted
gem because the crystals are too tiny. However, as drusy has come
into popular use in jewelry, the stone is cut en cabochon and used
in pendants, earrings and pins.