Related Clues:

• Emerald or opal
• Opal, for one
• Thing in an expensive ring
• Ruby or emerald, e.g
• A diamond is one
• 53-Across, for one
• The diamond in a ring
• Sparkling valuable
• Pitching masterpiece
• Alexandrite, e.g
• Ruby or onyx
• Loupe user's focus, perhaps
• Any precious stone
• Precious stone dug up in part of summertime garden
• Stone in part of Stonehenge, massive