Gold-Tone Ring with Blue Rectangular Gemstone

The item is a ring, appearing to be crafted from yellow gold or a gold-tone metal, featuring a prominent, rectangular cut, deep blue gemstone. The gemstone exhibits a vibrant, saturated blue color, reminiscent of a sapphire or a high-quality synthetic spinel or glass. Its facets, though not perfectly clear in the image, suggest an emerald or step cut, maximizing its surface area and color display. The setting for the central stone is a classic bezel or prong style, integrated into a decorative surround. The ring's shoulders display intricate scrollwork or filigree detailing, adding an antique or vintage aesthetic. The metalwork appears somewhat ornate, with a textured or possibly granulated finish visible around the central stone's bezel and on the shoulders. There might be small, secondary stones or metal beads set within this decorative work on the shoulders, though their exact nature is unclear from the image. The overall condition suggests some wear, with minor surface abrasions common for an item of its age, though no significant damage like cracks or chips are apparent on the gemstone. The metal shows a gentle patina consistent with age, enhancing its classic appearance. Without clear hallmarks, determining the exact metal purity or manufacturing origin is difficult, but the design points towards a period revival style, possibly mid-20th century or earlier, given the substantial setting and decorative elements. The craftsmanship appears solid, indicative of a quality piece of costume jewelry or possibly fine jewelry if the stone is natural.