Vintage 18K Gold Plated Black Onyx and Rhinestone Cocktail Ring

This is a vintage ladies' cocktail ring featuring a large, oval-cut black onyx cabochon as the central focal point. The ring is constructed with an 18K gold-plated base metal, showcasing a distinct S-curve or 'swirl' decorative element that crosses over the face of the stone. This decorative gold-tone wave is accented with three small, round-cut clear stones, likely rhinestones or cubic zirconia, set in a diagonal row within a textured channel. The onyx stone is secured by four visible prongs. The band is a simple, slender round shank. On the interior of the band, a partial hallmark is visible, which appears to read '18K HGE' (Heavy Gold Electroplate), indicating the piece is high-quality costume jewelry rather than solid gold. The design aesthetic is characteristic of the late 20th century, approximately the 1970s or 1980s, leaning toward a bold, mid-century modern influence. Condition-wise, the gold plating shows significant wear and thinning, especially along the bottom of the shank and the edges of the setting where the base metal is beginning to show through. There is minor surface scratching on the onyx, common for its age, though no major chips are present. The craftsmanship is typical for mass-market fashion jewelry of that era, utilizing a cast assembly method.

I have conducted a visual examination of the vintage ladies' cocktail ring described. The piece is identified as high-quality costume jewelry, specifically marked '18K HGE,' which signifies Heavy Gold Electroplate over a base metal. The design features a prominent black onyx cabochon accented by a rhinestone-set S-curve, aesthetic hallmarks of the 1970s-1980s mass-market fashion era. My assessment of the condition reveals significant thinning of the gold plating and visible wear on the shank, which suggests frequent use and reduces the overall collectible grade. The black onyx shows minor surface abrasions, consistent with a Mohs hardness of 6.5-7 over several decades of wear. In the current secondary market, demand for mid-range gold-plated costume jewelry is steady but modest. Comparable items from manufacturers like ESP or Lind typically sell within the $20 to $50 range depending on the integrity of the plating. The value is primarily driven by the 'retro' aesthetic rather than intrinsic material worth, as the gold content is negligible. Please note that this appraisal is based on photographic evidence and descriptions. A definitive valuation would require an in-person inspection to verify the stones aren't glass imitations and to check for further structural fatigue. Full authentication of the base metal and the stone's origin would necessitate acid testing and gemological refractive index testing, which cannot be performed remotely. No provenance documentation was provided to suggest a higher designer or historical value.