Art Nouveau flower brooch

An American Art Nouveau brooch in 14 carat gold with white opaque frosted enamel, flowing in different shades of green at the heart of the flower, five petals, in the middle an old cut diamond of circa 0.10 carat, with master’s mark for the Riker brothers, circa 1890, Newark, U.S.A.

Dimensions: 3.5 x 3 cm.