Related Clues:

• Marble type
• Prized rock
• Black gemstone
• Cat's-eye, e.g.
• Lapidary's item
• It may be precious
• Rock composed of quartz
• Intaglio stone
• Onyx, e.g.
• Fine print, perhaps
• Lapidarist's item
• Agate variety
• Striped quartz
• Emerald, e.g.
• Variety of chalcedony