RING SIZE (UK)CIRCUMFERENCE (MM)RING SIZE (UK)CIRCUMFERENCE (MM)A37.8N53.8B39.1O55.1C40.4P56.3D41.7Q57.6E42.9R58.9F44.2S60.2G45.5T61.4H46.8U62.7I48.0V64.0J48.7W65.3K50.0X66.6L51.2Y67.8M52.5Z68.5