Related Clues:

• Gem from the Latin for "precious stone"
• Word with black or fire
• Birthstone for 36-Across
• Grandmother in the comic strip "Pickles"
• It's worn by some Libras
• Autumnal birthstone
• Cameo choice
• Australian mine find
• Semiprecious gem
• Form of silicon dioxide
• Banded chalcedony
• Material for a cameo
• It's softer than quartz
• A gem of a name?
• Birthstone of some Libras