9ct yellow gold Amethyst, surrounded by a halo of natural diamonds in a ring setting.
Amethyst: 1.99ct (8.95 x 6.95mm)
Diamond halo: 11.5 x 9.6mm
Shank: 2.84mm width tapering down to 1.95mm at the bottom
Size: N 
Weight: 2.635g approx.