Vintage St. John Clip-On Earring with Blue Faceted Stone

This item is identified as a single vintage St. John clip-on earring, characterized by its octagonal shape and prominent central blue faceted 'gemstone'. The earring features a metallic, likely gold-toned or gold-plated, base setting. The central stone is a large, circular, deeply faceted jewel, exhibiting a vibrant sapphire-blue hue. Its facets are clearly visible, creating a kaleidoscopic effect with light reflection. Surrounding this central blue stone is a border of numerous small, clear, round-cut pavé-set rhinestones or crystals, which provide additional sparkle and contrast. These smaller stones appear uniformly sized and closely set, indicating a quality setting style. The overall shape of the earring is octagonal, with distinct, well-defined edges on the metal frame that encloses both the central stone and the pavé-set border. The craftsmanship appears to be of good quality for costume jewelry, with no visible missing stones or significant tarnishing on the metal from the provided image. The term 'vintage' suggests an estimated age of several decades, likely mid to late 20th century. As a clip-on earring, it is designed for ease of wear without requiring pierced ears. The primary condition visible is the integrity of the stones and metal finish, which appear well-preserved.