Gemstone Glossary - U

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

ULTRASONIC CLEANER - Chemical used for the cleaning of jewelry.

USBM - United States Bureau of Mines

Amazonite Gemstone Charoite Gemstone Chrysoberyl Gemstone Hematite Gemstone Spinel Gemstone