Diamonds

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Across
  1. 2. ___ are forever
  2. 6. Not cheap
  3. 8. A little more than pretty
  4. 10. See-through
  5. 11. Uncommon
Down
  1. 1. 'C' in the Periodic Table
  2. 3. Nothing can break it
  3. 4. Great value
  4. 5. Dignified
  5. 7. Long-lasting
  6. 9. One of a kind