Men's 14k Yellow Gold Onyx and Diamond Signet Ring

This is a vintage-style men's signet ring crafted in 14k yellow gold with a substantial weight of approximately 8 grams. The central feature is a large, rectangular black onyx tablet with clipped corners, securely bezel-set into the gold mount. At the center of the onyx is a white gold or rhodium-finished lozenge-shaped (rhombus) inlay featuring a milgrain border and a single round brilliant-cut diamond. The diamond appears to be approximately 0.02 to 0.05 carats, set in a starburst or illusion-style mount. The shoulders of the ring exhibit a unique 'nugget' or hammered texture, providing a rugged contrast to the polished gold edges of the face. This style is characteristic of mid-to-late 20th-century masculine jewelry, likely dating from the 1970s to the 1980s. The construction is solid with a thick band, indicating high durability and quality craftsmanship. Surface wear is visible in the form of fine scratches on the gold and slight dullness to the onyx surface, consistent with regular use over several decades. No significant chips to the gemstone or structural repairs are immediately apparent.