Diamonds

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Across
  1. 3. color
  2. 6. Density
  3. 7. Hardness
  4. 9. color
  5. 11. can turn brown
  6. 12. color
Down
  1. 1. color
  2. 2. can catch on fire
  3. 4. Not electrical conductor
  4. 5. C Burning point
  5. 8. not poisonous
  6. 10. radioactive