Gems

Clues in this puzzle

Across

• Silica mineral known for its iridescent play of color (4)
• Oldest known mineral on Earth, historically employed as a diamond simulant (6)
• Prized green rock often carved into intricate figures (4)

Down

• Oceanic sphere formed naturally inside an oyster shell (5)
• Metal rim surrounding a set stone to hold it securely in place (5)
• Golden-yellow birthstone traditionally associated with November (5)
• Minor gemstone formed from decaying wood under extreme pressure (3)

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