A 19th century fancy diamond and white diamond target pendant

A 19th century fancy diamond and white diamond target pendant, centred with an old cushion-shaped fancy-coloured diamond, within a double surround of graduated old cushion-shaped diamonds, quartered with four large old circular-cut diamonds, with a detachable diamond-set bail, set in silver on gold, on a later ropetwist gold chain necklace, pendant 4cm high, necklace 72cm long

The centred diamond is natural light brown as per verbal report from GCS.