This word is used to denote such stones as are considered by mankind as precious. These are, the diamond, the ruby, sapphire, topaz, chrysolite, beryl, emerald, hyacinth, amethyst, garnet, tourmalin, opal; and to these may be added, rock crystal, the finer flints of pebbles, cat's eye, hydrophanes, chalcedony, moon-stone, onyx, cornelian, sardonyx, agates, and Labrador stone, for which, consult the several articles respectively.