18k white and yellow gold diamond and sapphire ring

A diamond and sapphire ring - an oval sapphire of 3.40ct of medium blue very good clarity and cut surrounded by 12 old mine cut diamonds (total of 1.75ct)  set 18k white and yellow gold - dimensions of face 18 x 16mm - currently size S (USA 9 1/8) - please enquire to resize - c.1900 Europe