1980s Emerald, Diamond, Onyx & Black Enamel Buckle Ring

1980s emerald, diamond, onyx and black enamel buckle ring in 18kt yellow gold. Centrally set with a graduating line of square step cut emeralds in channel settings, surrounded by a row of square and baguette cut diamonds in channel settings, further enhanced with a border of black onyx and black enamel, to a stylised angular buckle design with polished borders and terminals, fitted to the reverse with a broad shank. Marked 18kt gold.