Mid-century style marquise-cut green stone ring with halo setting

This ring features an elongated marquise-cut cabochon stone in a mossy, translucent green hue. The central stone is stylistically consistent with materials like nephrite jade or green chalcedony, though without physical testing, its composition remains a hypothesis. The stone is secured by two large v-shaped prongs at the tips and a halo of nineteen small, colorless round-cut stones that appear consistent in style with white zircons or crystals. The metal has the appearance of yellow gold or gold plating, with visible wear to the finish on the prongs and the band's outer surface, showing some possible loss of luster and slight scratches. The halo stones are set in what looks like white-toned metal or rhodium plating, a technique common in mid-to-late 20th-century costume jewelry to enhance the brightness of the accent stones. No maker's marks or metal fineness stamps (such as '14K' or 'Sterling') are visible in the image, so the metal content and manufacturer are unverified. The construction suggests a production style from the 1960s to 1980s, common in both fine and higher-end costume jewelry markets from that era.

Based on my visual examination of the provided image, I have evaluated this Mid-century style marquise-cut ring. The item features a translucent green cabochon and a clear stone halo, which I hypothesize to be green chalcedony or nephrite jade surrounded by white zircons or crystals, set in a gold-toned metal. Based on what I can see, there are no visible fineness stamps or maker's marks, which significantly impacts the valuation. The wear on the prongs and band suggests the metal may be gold-plated rather than solid gold, a common characteristic of high-end costume jewelry from the 1960s–1980s. I cannot verify the specific stone species or metal purity from a photo; physical testing such as a scratch test, acid test, or refractometer reading would be required to confirm the materials. The estimate of $75-$150 reflects the market for vintage costume jewelry of this aesthetic. This value is based on the assumption that the materials are non-precious or semi-precious. If the item were found to be 14K gold with natural untreated gemstones through an in-person examination, the value could increase to the $400-$600 range. Conversely, if the central stone is identified as plastic or glass, the value would likely drop below $40. General market demand for 'Mid-century' jewelry remains steady, though the lack of an identifiable brand or hallmark limits its collectibility. To confirm the authenticity of the materials and potential origin, a physical inspection by a certified gemologist and an acid test of the metal are necessary.