9ct Yellow Gold & Sapphires Ring 2.8g Size O 1/2 British Hallmark Sheffield

Sweet feminine ring in form of a bow,cute . It is hallmarked 375 with British Hallmark for Sheffield Crown but can't see clearly the letter to date it, anyway before 1974. It has sapphires and cubic zirconia clear stones. Beautiful. Size approx O 1/2 and weight 2.8g. Good condition:-) Thank you for looking:-)