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Adjective: crystal clear
  1. Transmitting light; able to be seen through with clarity
    "crystal clear skies";
    - crystalline, limpid, lucid, pellucid, transparent
     
  2. (of language) transparently clear; easily understandable
    "a crystal clear explanation";
    - limpid, lucid, luculent, pellucid, perspicuous

See also: clear