This is a malachite, emerald, and CZ disc necklace, likely made with 925 sterling silver. Design: The necklace features a large, circular malachite pendant with a halo of small, round cz. In the center of the malachite disc is a rectangular-cut green Gemstone,, set in a gold-toned bezel. Materials: It is typically crafted in 14k or 18k yellow gold. The main gemstones are malachite, emerald, and diamonds. Chain: The pendant is on a delicate cable chain, often adjustable in length (e.g., 16-18 inches) with a secure clasp. Aesthetic: The piece combines vibrant green gemstones with sparkling diamonds for an elegant and modern look, often described as a statement piece.