n. A precious stone or gem; especially, a gem cut and shaped for ornament or use: as, the jewels of a crown.n. An article of personal adornment, consisting of a gem or gems in a setting of precious metal; also, formerly, any piece of jewel-work, or a trinket or ornament worn on the person, as a ring, a bracelet, or a brooch.n. An ornament of precious stones, or metal, enamel, etc., worn as a decoration, or as the badge of an honorary order: as, the jewel of the Garter.n. A precious stone used in watchmaking, on account of its hardness and resistance to wear, as where a pivot turns in a socket.n. An imitation, in glass or enamel, of areal jewel. See jeweled, 3.n. In colored-glass windows, etc., a projecting boss of glass, sometimes cut with facets, introduced in the design to give variety and richness of effect.n. Anything of great value or rare excellence; anything especially fine or dear: sometimes applied to persons as a term of high commendation or tender endearment.