Vintage Gold Tone Filigree Blue Cabochon Screw-Back Earrings

This is a pair of vintage screw-back earrings, crafted in a gold-tone metal with a delicate filigree design. Each earring features a prominent oval-shaped, iridescent blue stone, likely a cabochon, set prominently in the center. The blue stone exhibits a subtle play of color or sheen, suggesting it might be a type of man-made glass (such as a 'moonstone' simulant or art glass) or a natural material like chalcedony or synthetic opal, though precise identification without closer inspection is difficult. The stone is securely held by a bezel setting, appearing to be surrounded by small prongs or a smooth metal rim. The gold-tone metal exhibits an antique or aged patina, visible as some darkening in the crevices of the filigree work, which enhances the decorative elements. The filigree work itself is intricate, forming a graceful, almost floral or scroll-like pattern around the central stone, giving the earrings an elegant and classic appearance. The total weight of the pair is 5 grams. The reverse side clearly shows a screw-back mechanism, indicating these are not designed for pierced ears but rather to be tightened onto the earlobe. The craftsmanship appears to be of good quality for costume jewelry of its era, with no obvious signs of significant damage like breaks, missing filigree, or loose stones, although typical surface wear and minor scratching consistent with age and use might be present on closer examination. The style points to a mid-20th-century aesthetic, possibly from the 1940s to 1960s, reflecting a period when screw-back earrings were common.