Rhinestone or Paste-Set Single Stud Earring or Decorative Button

This item is a circular, solitaire-style decorative piece, likely a stud earring, cufflink, or a garment button, featuring a central clear facet-cut stone. The central stone appears to be a colorless rhinestone or glass 'paste' gem, imitation of a diamond, set within a tiered metallic bezel. The innermost bezel ring is finished in a polished gold-tone or brass, while the outer surrounding rim has an irregular, textured silver-tone appearance. The construction indicates a costume jewelry quality rather than fine jewelry, given the visible irregularities in the outer casting and the lack of precision in the stone's seating. The overall diameter appears quite small, likely between 8mm to 12mm. The piece shows visible signs of wear with some tarnishing on the metal surfaces and minor surface scratches on the facets of the central stone. No maker's marks or hallmarks are visible from the top view. Based on the style and mass-produced aesthetic, this item likely dates from the late 20th century to the present day. The craftsmanship is functional for costume wear but lacks the high-end finishing of luxury goods.