Black sapphire and lab diamond Cairn ringCairn by Christine Sadler This is a handmade contemporary black sapphire and lab diamond ring which is perfect to be worn as a right hand ring. The ring measures 12. 6mm wide at the front and tapers at the back to a solid band where the three strands of gold meet. The back of the ring is 4mm wide. The black sapphire measures 4. 5mm in diameter and the three brilliant cut lab diamonds are 3mm in diameter. The diamonds are G colour VS clarity. This