A pink sapphire and diamond cocktail ring of knot design, circa 1960s, centred with a navette-shaped pink sapphire of 9.1 x 6.3 x 4.5 mm, mildly dichroic with intense reddish-pink body colour, claw-set within a stepped surround encrusted with calibr?-cut diamonds, further embellished with baguette-cut diamonds and transitional-cut diamonds on shoulders, white metal marked '750', ring head 2.3 x 1.7 cm, ring size Q, total weight of item 17.2 grams.