Oval Cut Brown Gemstone or Glass with Four-Prong Setting

This item appears to be an oval-cut, faceted brown gemstone or high-quality glass set in a four-prong, open-back setting. The stone exhibits a deep, rich brown color, possibly smoky quartz, brown topaz, or a finely crafted glass imitation. Its elliptical shape is precisely cut with numerous facets on both the crown and pavilion, creating a high degree of brilliance and light reflection, evident from the internal shimmering reflections seen in the image. The setting material appears to be a yellow-toned metal, likely gold-plated or brass, which is visible at the four corner prongs securely holding the stone. The open-back design of the setting allows light to pass through the pavilion of the stone, enhancing its sparkle. There are no visible chips, cracks, or significant abrasions on the main surface of the stone, suggesting good condition. The metal prongs show no obvious signs of bending or damage. Given the simple yet elegant setting, it could be a component for a ring, earring, pendant, or a loose stone intended for custom jewelry creation. The style suggests it could range from modern minimalist to a classic vintage piece. Without maker's marks or further context, precise manufacturing details and age are difficult to ascertain, but the quality of the faceting points to a well-manufactured item.