An 18k gold diamond solitaire ring Cast gold ring band with sumptuous Historicist relief decoration. The shoulders with finely chased Medusa motifs flanking a central bezel set transition-cut diamond (ca. 3.80 ct, ca. 9.53 x 9.91 x 6.29 mm, O/P, vvs, no fluorescence). Ring size 57. Weight 20.67 g. Florence, Jeweller Giani & Venturi. 1970s/1980s.