The "Shiva Eye Shell," also known as a "Pacific Cat's Eye," is a natural gem, specifically the protective "door" or operculum of the Turban snail, found in shallow tropical waters of Southeast Asia. It's named after the Hindu god Shiva, representing his third eye. 
 
In metaphysical beliefs, the Shiva shell, a marine snail shell, is seen as a symbol of protection, intuition, and spiritual awakening, often associated with the third eye chakra and Lord Shiva. 
 
Picked at random.