An Art Deco emerald and diamond plaque ring, slightly raised at the centre with a square step-cut emerald with canted corners, bright bluish-green approximately measures 5.5 x 5.5 x 3.5 mm, flanked by four baguette-cut diamonds, on a navette scalloped panel set throughout with various sized old-cut diamonds, with an estimated total diamond weight of 1.60ct, to a flat shank with chenier shoulders, white metal marked 'Platinum', ring head measures 2.4 x 1.5 cm, ring size Q½, total weight of item 5.5 grams.