This is a Jay King turquoise bead necklace with large central stones.

This item is a chunky turquoise nugget bead necklace, a popular style of Southwestern or Native American-inspired jewelry. The necklace features irregularly shaped turquoise stones of varying sizes, with the larger, crescent-shaped pieces centered at the front. The beads are strung and connected by a silver-toned clasp assembly.
Key Details
Style: It is a beaded statement necklace, often associated with Southwestern and Native American designs, known for its bold look.
Materials: The primary material appears to be natural turquoise, which is typically found in shades of blue-green and often has a visible matrix (veining). The clasp is a silver-toned metal, likely sterling silver.