Opal is recognized as the queen of all gemstones
and is one of the oldest gemstones since ancient
civilization. The term Opal is thought to be taken
from the Sanskrit Upala, which means "precious
stone," and after the Greek derivative "Opallios,"
which means to see a change of color. The stone
can be found in gray, blue, pink, yellow, and
brown colors and looks transparent to opaque in
appearance.