Related Clues:

• It's impressive
• Tiara component
• Thing in a ring?
• Ruby, e.g
• 50-Across, e.g
• Amethyst, for one
• Stony sparkler
• Ruby or topaz
• Potential Guinness Book entry
• Emerald, e.g
• Onyx, e.g
• Sparkly stone
• Neat trick
• Act of derring-do
• Major achievement