1. A transparent piece of diamond that has been cut and polished and is valued as a precious gem (synset 113393131)
  2. Very hard native crystalline carbon valued as a gem (synset 114858733)
  3. A parallelogram with four equal sides;
    An oblique-angled equilateral parallelogram (synset 113905618)
  4. A playing card in the minor suit that has one or more red rhombuses on it (synset 103192656)
    "he led a small diamond"; "diamonds were trumps"
  5. The area of a baseball field that is enclosed by 3 bases and home plate (synset 102802752)
  6. The baseball playing field (synset 102783939)

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