a naturally occuring gemstone that may be a shade of green, yellow, white, blue or red (depending upon the impurities present). Green varities are called emeralds while cyan variieties are called aquamarines.
the deep blue cloak which was thrown over his shoulders was lined with flame-coloured silk and secured at the neck with a brooch which consisted of a single flaming beryl.
Arthur Conan Doyle. The Adventures of Sherlock Holmes. A Scandal in Bohemia