A LARGE SYNTHETIC COLOUR CHANGE STONE RING

rectangular cut and showing blue-purple colour change, approx. 18 x 16mm in a four corner claw 9ct yellow gold setting with open chenier shoulders stamped 9ct and a collection of other pink or purple gemstone rings, including examples set with mystic topaz, ametrine and pink topaz all in 9 or 14ct yellow or white gold (14)