Rare Purple Spiny Oyster Shell Necklace

Purple Spiny Oyster Shell pendant on a .85mm beaded Venetian 18" chain with a lobster clasp, branded. 
Stone is 20mm x 10mm

Hand crafted by "831 Coastal Jewelry" Monterey CA USA

Purple spiny oyster is rare because the deep purple color indicates an older, deeper-dwelling oyster and less than 5% of harvested spiny oysters are purple. The shells are found in the Sea of Cortez, require labor-intensive harvesting from deeper, colder waters, and are highly valued by artists for Native American jewelry