Chinese ceramic ware is an art form that has been developing since the dynastic periods. China is richly endowed with the raw materials needed for making ceramics. The first types of ceramics were made about 11,000 years ago, during the Paleolithic era. Chinese Ceramics range from construction materials such as bricks and tiles, to hand-built pottery vessels fired in bonfires or kilns, to the sophisticated porcelain wares made for the imperial court.
Although probably not from the Tang Dynasty these double happiness beads are very popularly seen in most popular Chinese ceramics and jewelry, I even bought myself a full necklace of these beads while I was in Hong Kong !