Princess-Cut Stud Earring or Pendant Set in Silver-Tone Finish

This item is a single princess-cut (square) faceted stone, likely a cubic zirconia or glass simulant, set in a four-prong basket mounting. The stone is of substantial size and displays high brilliance with significant light dispersion, suggesting a synthetic composition rather than a natural diamond. The metal setting appears to be a silver-tone alloy, showing significant signs of wear and oxidation. Notably, the finish exhibits a dark, mottled patina and areas of pitting around the base and prongs, which may indicate a silver-plated base metal where the plating has worn away. The construction features a standard basket-style setting with high-seated prongs that securely hold the corners of the square-cut stone. There are no clearly visible maker's marks or metal fineness stamps (such as 925 or 14K) in the current view, which is common for costume jewelry. The item shows signs of significant environmental exposure, with dirt accumulation and tarnish present within the crevices of the mounting. Based on the craftsmanship and wear patterns, this appears to be a contemporary piece of fashion or costume jewelry rather than a high-end gemstone piece. The value would be primarily decorative, given the condition and materials used.