An 18 carat gold diamond solitaire ring

An 18 carat gold diamond solitaire ring, the old brilliant cut diamond measuring approx 6.6 x 7.2 x 3.1mm deep, estimated to weigh in the region of 0.80 - 0.90 carat, estimated grades colour F, clarity Si1, assesed in the mount, ring size V, 8.7 gms.