Antique Art Nouveau Plique A Jour Artist Signed French 18K Gold Diamonds Pendant. This is a stunning and rare marked French Art Nouveau pendant c. 1910. The pendant is artist signed M. Jampolsky. The pendant depicts the Virgin Mary with an enamel halo and stars. The plique a jour has two shades of blue. The pendant has a multicolor gold design. There are 15 large rose cut diamonds. They are white and sparkly I color SI-1 clarity with a total weight of .07 carats. The pendant is in excellent condition. It measures 46 mm high x 35 mm wide. Weight 10.9 grams.