Art Nouveau period, 1903, gold and platinum plaque-de-cou necklace by artist Henri Dubret is a gem-set and enamel masterpiece of polychrome butterflies, flowers, and foliage. A diamond blossom centering an oval-cut emerald sits amidst three spotted polychrome basse-taille enamel and diamond butterflies, all framed by orange and green sinuous vines with diamond highlights, a single pearl pendant, seemingly dripping from the plaque. Mounted on a broad velvet ribbon with a gold bar closure.