Signet-style ring with intaglio-carved stone

This appears to be a heavy signet-style ring featuring a rectangular black stone with an intaglio carving. The carving depicts what appears to be a classical or mythological scene, possibly a chariot or historical figures, consistent with the style of hematite or onyx intaglios popular in the mid-to-late 20th century. The metal has a yellow-gold tone and bears an internal stamp that reads "10K", which is consistent with 10-karat gold purity, though this marking is unverified without professional acid or XRF testing. The mounting is robust with wide, smooth shoulders and a thick shank. Visible condition issues include significant fine scratching and scuffing on the polished metal surfaces, consistent with regular wear over time. The edges of the black stone show some minor surface abrasions and dust accumulation in the crevices of the carving. The ring's design is consistent with menswear jewelry from the 1940s through the 1970s. Without a maker's mark or physical inspection, the material of the stone (e.g., glass, onyx, or hematite) and the chemical composition of the metal remain unverified hypotheses.

Based on my examination of the provided image, this item appears to be a 10K yellow gold men's signet-style ring featuring a carved intaglio stone, likely onyx or hematite. The ring bears a '10K' mark, which I am treating as a working hypothesis for gold purity; however, I cannot verify the metal's chemical composition or the stone's mineral identity without professional acid testing or an XRF analysis. The design and construction are consistent with mid-20th-century menswear styles, approximately 1940s–1970s. The value estimate is based on the assumption that the 10K gold marking is accurate and that the stone is a natural material rather than glass or synthetic resin. The presence of significant surface scuffing and abrasions on the metal reduces the value compared to a mint condition example, as it would likely require professional polishing. The market demand for vintage intaglio signet rings remains stable, particularly for pieces with classical subject matter. If the ring were found to be gold-plated or if the stone is a glass reproduction, the value would likely drop to the $50–$100 range. To confirm this appraisal, an in-person physical inspection is required to test the gold content, verify the weight, and inspect the intaglio under magnification to determine if it is handset or molded. This estimate represents the fair market value for a vintage piece of this type if the assumed materials are correct.