Carnelian is a precious stone, ordinarily of a blood red, or bordering on orange. In many of its characters it nearly resembles the common chalcedony. It is but little transparent, cuts easily; and we find most of the tine engravings of antiquity, whether in relievo or indented, are on this stone. In the tire it loses its red colour and becomes opaque. The finest carnelians are those brought from near Babylon, Arabia, and Hindostan; the next are those of Sardinia ; the last, those of the Rhine, Bohemia, and Silesia. To give these stones a greater lustre, in setting them, a piece of silver leaf is laid underneath. The principal use made of carnelian is in seals, as it graves well, and takes a fine polish. It is also used for brace-lets and other ornaments.