Related Clues:

• Button material
• Mother-of-pearl
• Bead material
• Pearly shell layer
• Mollusk interior
• Inlay on some guitars
• Certain shell liner
• Button stuff
• Iridescent shell layer
• Mollusk's secretion
• Mollusk shell liner
• Mollusk creation
• Shell lining
• Mollusk shell material
• Fancy button material