The lower part of the brooch is made of yellow gold with purity Au 700 / 1000. Upper decorative cut-out part made of silver of Ag 970 / 1000 purity. Blue doublet set in the middle : one half natural stone, the other half blue glass. Cut rosettes set in decorative flowers and rings. Total weight 4,8 grams. Europe 1890 - 1920. Length 7,5 cm. Assay Office certificate.