Nacozari Turquoise, Spiny Oyster, and Sterling Silver NecklacePretty Turquoise and Spiny Oyster Necklace. A mix of Nacozari Turquoise nuggets, orange red spiny oyster, creamy white heshi shell beads and sterling silver accents. The necklace is finished with a lobster clasp and a 2 inch extender chain. All metal is solid 925 sterling silver. Nacozari turquoise comes from the Nacozari region in Sonora, Mexico, and is celebrated for its striking blue hues, often with minimal veining. This type of turquoise is