Across
- 2. O2
- 5. Last rock stage
- 7. "Rock Layers"
- 10. Think December (not holidays)
- 13. String Material
- 15. Hardest gemstone
- 16. An Element in Diamonds
- 20. Light Blue Gem
- 21. ________ are on the periodic table
Down
- 1. The birthstone is Purple
- 2. Heaviest metal
- 3. Blue Gem
- 4. Man's best friend
- 6. Mr. Crabs Daughter
- 8. villagers love them
- 9. Augusts birth stone
- 11. Red Gemstone (4 letters)
- 12. Fe
- 14. Cursed diamond (two words)
- 17. rainbow gem
- 18. cooled magma
- 19. Conductive Metal