Platinum, 18ct yellow gold, emerald and diamond ring, circa 1915, centring a collet-set square step-cut emerald weighing approximately 0.95 carat surrounded by an open work marquise-shaped border of collet and claw-set old-cut diamonds to diamond set shoulders, the diamonds together weighing approximately 1.77 carats, size M. Accompanied by an Agl Prestige Gemstone Report numbered 1091957, dated 27 April 2018, stating that the approximately 0.95 carat emerald is of Colombian origin with no indication of clarity enhancement.