Fantastic colours to the blue john stone found in the centre of this sterling silver celtic brooch pin from the 1970's. The sterling silver mark can be found to the rear along with the maker 'ASD'. The blue john stone does have natural feathers within as most blue john does see pictures. Good secure clasp & pin. Size 4.7 x 1.6 cm or 1.9 x 0.6 inches. Weight 7.8 grams or 4.875 penny weight.