Ring in the style of mid-century costume jewelry

This item appears to be a large cocktail ring featuring a prominent cabochon center stone. The stone is a translucent, pale seafoam green color, which is stylistically consistent with materials like chrysoprase, chalcedony, or possibly glass or resin. The stone is held in an ornate, high-profile gold-toned metal setting that features a decorative fleur-de-lis or crown-like prong structure along the perimeter. The band itself is textured with vertical ribbing, a design element often found in jewelry from the mid-20th century, approximately the 1950s or 1960s. There are no visible maker's marks, hallmarks, or metal purity stamps legible in the image, so the composition of the metal—whether fine gold or gold-plated base metal—cannot be verified from the photo. The condition appears well-preserved with a slight patina or softening of the metallic detail consistent with light wear. The identification is hedged as stylistic due to the lack of verifiable markings and the fact that such designs were widely produced by various manufacturers during the mid-century era.

Based on my review of the provided image, this cocktail ring appears to be a high-quality example of mid-century costume jewelry, likely dating from the 1950s or 1960s. The piece features a seafoam green cabochon—stylistically consistent with chalcedony or glass—set within an ornate, crown-like gold-toned mounting. Based on what I can see, the design exhibits the bold 'maximalist' aesthetic popular during this era. I cannot verify the metal composition or the exact nature of the stone from a photograph; while the ribs and prongs suggest a higher-tier costume manufacturer, the lack of visible hallmarks prevents me from attributing this to a specific house like Hattie Carnegie or Coppola e Toppo. The provided valuation assumes the piece is a designer-quality costume item in well-preserved vintage condition. Factors such as the textured vertical ribbing on the band suggest a level of craftsmanship that typically commands a premium in the vintage market. However, if physical inspection reveals the materials to be precious (such as 14k gold or natural chrysoprase), the value would increase significantly. Conversely, if it is a modern 'in the style of' reproduction or lacks a desirable maker's mark, the value would likely fall to the $30 - $60 range. To confirm this estimate, an in-person examination is required to check for hidden marks under the stone or inside the band, and to perform a streak or thermal test on the cabochon. Market demand for mid-century statement rings remains steady among collectors of 'Mad Men' era fashion, though the final price is heavily dependent on identifying a specific maker's mark.