Art Deco Art Deco and Sterling Festoon Necklace. Art Deco Jade and Sterling (marked and acid tested) festoon necklace. From the. 1930s this necklace is striking and in perfect condition. Set with five gorgeous green jade stones that are well matched and perfectly set. Two bows and three twists connect the sterling-set jade stones. Two oval cabochons lead to the large round central cabochon from which hangs one smaller cab that is the anchor for the large focal teardrop shaped jade stones. The jade stones are nicely polished with no damage. Jade is tough and brings prosperity so wear this necklace when you need that extra bit of confidence.