I recently obtained the cabinet card below. I think it is the state opening of Parliament around c1904-05 based on the fact Alexandra is wearing her collier resille made for her in 1904 by Cartier and later modified for Queen Mary.
However, its the large brooch that Alexandra is wearing on her breast that has me puzzled. it looks very similar to the cullinan "granny's chips" but that wasn't created till 1911. Does anyone have any ideas?