A late 19th century gold, silver, diamond and enamel miniature brooch

A late 19th century gold, silver, diamond and enamel miniature brooch
The rectangular plaque painted to depict two Indian goldsmiths at work, within silver, rose-cut diamond frame, the gallery foliate engraved, fitted case stamped Hamilton & Co Ltd, Jewellers and Silversmiths, Calcutta, Delhi and Simla
Signed on the gallery Hamilton & Co Ltd.