Three diamond, coloured diamond and gem-set rings, one by Jahan

Three diamond, coloured diamond and gem-set rings, one by Jahan
The first a yellow sapphire, diamond and black diamond flowerhead cluster, finger size S, black diamonds not tested for natural origin; the second set with a cushion-shaped orange sapphire within an openwork diamond-set frame, finger size S; the third of asymmetrical design set to one side with vari-cut vari-coloured citrine to a pavé diamond surround, finger size R
The first signed Jahan