Related Clues:

• Absolute treasure
• The hardest thing before match — it's achieved years later
• Stone that's worth a lot
• Ruby, for example
• Red card: did moan after fouling
• Hardest substance
• Item swapped in the game 'Bejeweled'
• Sapphire, for example
• *Ring centerpiece
• A big, fat diamond, for one
• No servant recalled duke, a very special chap
• Ruby or opal
• Stone in part of baseball playing area
• No servant upset duke? Brilliant!
• Opal, for example