Related Clues:

• Copper or aluminum
• Lead, for one
• Ruby, e.g.
• Idaho, the ___ State
• Prized rock
• Rock genre, informally
• Cat's-eye, e.g.
• Lapidary's item
• Gold, silver or bronze
• Copper or nickel
• Lapidarist's item
• Emerald, e.g.
• No-no in a microwave
• Valuable rock
• Amber, for one