Related Clues:

• "Faust," for one
• Birthstone
• Rossini work
• Gig for Domingo
• Phantom's locale
• Flagstad's field
• Opal or onyx
• Juilliard major
• Rare find
• Tour de force
• Price performance
• "The Magic Flute," e.g.
• Precious stone
• Bijou
• "Die Walküre," e.g.