[1] : The Collaborative International Dictionary of English v.0.48

gem \gem\, n. oe. gemme precious stone, f. gemme, fr. l. gemma
   a precious stone, bud.
   1. bot. a bud.
      1913 webster

            from the joints of thy prolific stem
            a swelling knot is raised called a gem. --denham.
      1913 webster

   2. a precious stone of any kind, as the ruby, emerald, topaz,
      sapphire, beryl, spinel, etc., especially when cut and
      polished for ornament; a jewel. --milton.
      1913 webster

   3. anything of small size, or expressed within brief limits,
      which is regarded as a gem on account of its beauty or
      value, as a small picture, a verse of poetry, a witty or
      wise saying.
      1913 webster

   artificial gem, an imitation of a gem, made of glass
      colored with metallic oxide. cf. paste, and strass.
      1913 webster
see also:
artificial gem paste strass 

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