Related Clues:

• Coin rating
• Nearly unique in the world
• Pretty pink
• Like an 1864 two cent piece
• Remarkable
• Like a black pearl
• Quite uncommon
• Pink or red, e.g.
• Endangered
• Pink, to a chef
• Seen once in a blue moon
• Not turning up much
• Like a white Bengal tiger
• How some steaks are cooked
• Like valued old books