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Prehistoric Black Horn Coral Slab Sterling Silver Ring

Currency:USD Category:Antiques Start Price:110.00 USD Estimated At:150.00 - 300.00 USD
Prehistoric Black Horn Coral Slab Sterling Silver Ring
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Slice of black horn coral, rugosa fossil (22mm) diameter, set into a stamped 925 sterling silver ring. Size 8. 6.8 grams horn & silver.  Horn corol fossil or rugosa, also called the tetracorallia, are an extinct order of solitary corals that were abundant in the Middle Ordovician ( 470 million to 458.4 million years ago ) to Late Permian (299 to 251 million years ago ) seas. Solitary rugosans are often referred to as horn corals because of a unique horn-shaped chamber with a wrinkled, or rugose, wall.