Crown jewel
Else clues• Rock
• Aquamarine or turquoise
• Diamond or ruby
• Emerald or ruby
• It's multifaceted
• Jewel
• Lapidary's item
• Mineral made into jewelry
• Opal or onyx
• Opal or topaz
• Ring thing
• Ruby, e.g.
• Sapphire or turquoise
• Set piece?
• Topaz or tourmaline
• Uncut ruby, e.g.
• A crystalline rock that can be cut and polished for jewelry