Related Clues:

• Ring rock
• Glittering valuable
• Valuable stone
• Item for 26-Across
• It's multifaceted
• Diamond, for one
• Setting sight
• Peach
• Great pitching effort, as it were
• Turquoise or topaz, e.g.
• What carats measure
• Topaz or turquoise
• Onyx or opal
• A loupe might be used on it
• Perfect instance