Modernist Brass Signet Ring with Crystal Accent

This item is a contemporary or mid-century style signet ring, characterized by its bold, geometric, and angular aesthetic. The ring is constructed from a yellow-toned base metal, likely brass or a gold-tone alloy, exhibiting a matte or brushed finish rather than a high-polish sheen. It features a rectangular, flat-top face with a singular, off-center inset brilliant-cut stone, which appears to be a clear glass crystal or cubic zirconia. To the left of the stone, there is a series of horizontal etched or engraved linear grooves, providing a subtle textural contrast. The shank is relatively wide and has a square profile that transitions into the flat head, typical of Brutalist or Modernist influence. In terms of condition, the piece shows significant signs of wear and oxidation; the metal surface displays a dull patina with dark spots and some greenish traces (verdigris), suggesting the degradation of a top plating or natural aging of a base metal. There are visible surface scratches and minor pitting across the flat face and band. No maker's marks or hallmarks are visible in the current orientation, suggesting it may be a mass-produced fashion or costume jewelry piece from the late 20th century.

I have conducted a visual examination of this Modernist-style signet ring. The piece is crafted from a non-precious yellow base metal, confirmed by the presence of verdigris and oxidation which indicates a high copper content, likely brass. The 'gemstone' exhibits the refractive qualities of a machine-cut glass crystal or cubic zirconia rather than a natural diamond. The condition is fair to poor, with significant loss of the original finish, surface pitting, and heavy oxidation that detracts from its aesthetic appeal. The lack of hallmarks or designer signatures suggests this is a mass-produced costume piece rather than a studio-crafted work. In the current secondary market, demand for non-branded, oxidized brass costume jewelry is low, as these items are typically valued for their utility as fashion accessories rather than investment pieces. Comparables include vintage high-street costume jewelry from the 1970s and 80s which frequently sell in this price bracket at estate sales. The primary factors suppressing value are the base-metal composition and the significant wear. Note that this appraisal is based on image analysis; a physical inspection using an acid test for metal purity and a thermal conductivity probe for the stone would be required to rule out gold plating or a high-quality lab-grown sapphire. Verification of provenance could slightly elevate interest if linked to a specific design movement, but the lack of stamps makes this unlikely.