E + O's diamond crossword puzzle

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Across
  1. 3. Solid, stiff, or strong
  2. 4. of sand "Pinch of salt"
  3. 6. Necklaces, bracelets, or rings
  4. 7. A way diamonds are identified
  5. 9. The chemical element
  6. 10. A precious stone
  7. 14. Used in pencils
  8. 15. The distant past
Down
  1. 1. The dimension or measurement of something
  2. 2. How diamonds are measured
  3. 3. Physical pressure that is above normal
  4. 5. A term for a beloved person
  5. 8. The largest and most massive layer in a planet
  6. 11. An area of extracting coal + other minerals
  7. 12. Known as CO2
  8. 13. The form or outline of something