Simulated tortoise: A synthetic material resembling the mottled brown and yellow color found on tortoise shells.
Slate: A smooth, solid gray fine-grained rock that can be split into thin layers.
Simulated tortoise: Imitation of the mottled brown and yellow color found on tortise shells.
Slide: An ornament that can be slid onto another piece of jewelry such as a necklace.
Celluloid is an early plastic that was invented in 1868 and used in jewelry to simulated tortoise shell, coral and alabaster. It was quickly abandoned for heavier, more stable plastics invented in the later part of the 19th century.
 See also: Gemstones, Color, Earring, Necklace, Sterling
  
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