An Art Nouveau Yellow Gold, Platinum, Diamond, Onyx and Polychrome Enamel Pendant Necklace, consisting of a drop pendant containing a pear shape cabochon cut onyx surmounted with two old European cut diamonds weighing approximately 0.45 carat total against a background of translucent green, blue and pink enamel, the base and top accented with five old European cut diamonds weighing approximately 0.15 carat total and an ovoid shaped enamel bead, the pendant is suspended from a platinum filigree chain accented with two matching stations containing six old European cut diamonds weighing approximately 0.09 carat total and accents of green and blue enamel, later 14 karat white gold clasp. 7.10 dwts.