Vintage Art Deco Initial L Onyx and Diamond Ring

This is a vintage men's or unisex signet-style ring, likely dating from the 1930s to the 1950s. The primary construction features a yellow gold band and setting with ornate scrollwork engraving along the shoulders. The central face is set with a geometric, trapezoidal black onyx slab. Inset into the onyx is a decorative yellow gold initial 'L' with a textured, hatched finish. Directly above the onyx is a triangular white metal (likely white gold or platinum) setting containing an old European or single-cut diamond. The color contrast between the yellow gold, black onyx, and white metal accents is characteristic of the Art Deco and Retro eras. The overall condition shows signs of moderate wear with fine surface scratches on the gold and onyx. There is visible grime accumulation in the crevices of the initial and engraving, suggesting the ring has been worn regularly. The craftsmanship appears to be of high-quality commercial grade from the mid-20th century, displaying complex multi-part assembly and hand-engraved details.