This is a Mexican sterling silver mosaic brooch. The material is 925 sterling silver (the "MEXICO" and silver mark on the back conform to Mexican silver jewelry standards); The craftsmanship is mosaic inlay: the main surface uses a deep blue resin/enamel base, inlaid with turquoise, malachite, and other fragments, paired with silver geometric lines; the pendant also uses the same inlay technique. The style incorporates traditional Mexican Aztec/Maya symbols: the central stepped pattern is a geometric totem of ancient civilization (symbolizing land, sacrifice, or the natural cycle), and the silver bead decorations around the edges are a classic detail of Taxco silver jewelry; It is a two-in-one design: the back has a brooch pin and a hanging loop, so it can be used as a brooch to decorate clothing or as a pendant to wear with a necklace.