The Collaborative International Dictionary of English v.0.48:

Rhinestone \Rhine"stone`\, n. [Cf. G. rheinkiesel Rhine quartz.]
   A colorless stone of high luster, made of paste. It is much
   used as an inexpensive ornament.
   [1913 Webster]

WordNet (r) 3.0 (2006):

rhinestone
    n 1: an imitation diamond made from rock crystal or glass or
         paste

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "rhinestone":
   anklet, armlet, bangle, beads, bijou, bracelet, breastpin, brooch,
   chain, chaplet, charm, chatelaine, circle, coronet, crown, diadem,
   earring, fob, gem, jewel, locket, necklace, nose ring, pin,
   precious stone, ring, stickpin, stone, tiara, torque, wampum,
   wristband, wristlet