Related Clues:

• Cat's-eye, e.g.
• ''To Sir, With Love'' singer
• ''To Sir With Love'' songstress
• Lapidary's item
• Extraordinary thing
• It may be precious
• Lapidarist's item
• Emerald, e.g.
• A real doozie
• Valuable rock
• Amber, for one
• ''To Sir, With Love'' vocalist
• Ring feature
• Precious thing
• Tourmaline or amethyst, e.g.