Art Nouveau gold ring with diamonds and sea pearl

Yellow and white 18 carat gold. Fineness Au 750 / 1000, total weight 3,35 g. Six natural diamonds rose cut. Natural sea pearl. Art Nouveau period and style. Ring rim and lower part of the crown in 18 carat yellow gold. Set with natural diamonds in white gold. Floral shaped head of the ring with a central set natural sea pearl. Two round larger natural diamonds rose cut set on the sides. Four smaller natural diamond rose cut set in the leaves. Marked: new valid Czech hallmark head of a cock. Europe, circa 1900. Ring size 52.