Art Nouveau Style Marcasite Mask Pendant Necklace

This is an antique or vintage necklace featuring a detailed pendant designed in the Art Nouveau style, possibly adorned with marcasite. The pendant prominently displays a sculptural mask-like face, characterized by flowing lines and an organic, stylized form that are hallmarks of the Art Nouveau aesthetic. The face appears to be a dual representation or an abstract depiction with distinct eye and nose features. The metal seems to be a darkened silver or base metal, exhibiting an oxidized or antiqued finish that enhances the intricate details and gives it an aged appearance. Small, faceted stones, consistent with marcasites, are visible as embellishments on the pendant, contributing to its subtle sparkle. The necklace chain is composed of interconnected, elongated, and twisted links, creating a delicate yet ornate appearance. It is a darker metallic color, matching the pendant. The chain terminates with a simple round spring ring clasp, indicating a common fastening mechanism for vintage jewelry. No explicit maker's marks or stamps are visible in the provided image. The overall condition appears good with a natural patina from age, common for pieces of this type and era. The craftsmanship suggests a commercially produced item from the early to mid-20th century, likely dating from the Art Nouveau period (1890-1910) or a later revival. The size of the pendant is estimated to be moderate, suitable as a focal point without being overly large.