Beryl

Etymology
Ultimately from βήρυλλος:.

Noun

 * 1)   A mineral of pegmatite deposits, often used as a gemstone.
 * 2)  An example of the mineral beryl.
 * The crown was set with six beryls of excellent size and color.
 * 1)  a dull blue colour.

Adjective

 * 1) Of a dull blue colour.

Derived terms

 * beryllium
 * beryllium oxide
 * chrysoberyl

Related terms

 * chrysoprase
 * brilliant