This is an old metal bracelet with 2 dragon heads and a ball in between their wide open mouth. There are a number of articles relating to Dragons chasing the Pearl in legends. This is an interesting piece of jewelry. The dragon heads are meticulously crafted.  The design is diagonal in shape which makes it easier to slip the hand through it. Dimensions of the inside diameter of the bracelet: Outside width is 3.6", Inside width is 3.0" Height is a 3.1" from the ball down. The ball is 16mm in size. The bracelet weighs about 80 grams. 

The silver content of the bracelet depends on its origin. If it is the work of the Miao people, we can say that "Miao silver is not pure silver, but an alloy of silver, copper and nickel. It’s a traditional material for making jewelry by craftsmen of Miao Hmong ethnic tribe.  The percentage of silver is about 60%." If it is the work of Tibetan craft artists,  "historically, Tibetan silver contained 30 percent of silver, but today this is rarely the case. Modern Tibetan silver is usually cast from a mixture of copper, nickel and a small amount of silver."

Information on the DRAGON'S PRECIOUS PEARL

The meaning and significance of the so-called Pearl which accompanies the dragon in pictures and legends from the earliest times, (common to the religious traditions of the whole East--India, China and Japan)  is best preserved in Buddhism as the "divine pearl' of the Buddhists throughout the Orient. In China alone this mystical accessory of the dragon made a significant part in pictures and decorative designs. Some say that originally every proper dragon carried a pearl under his chin; that it was a special mark of imperial rank. 

An eighteenth century vase described by Chait is "decorated with nine dragons (a mystic number) whirling through scrolled clouds enveloping parts of their serpentine bodies in pursuit of jewels of omnipotence. Chinese Buddhists  also identified the ball with their cintamani or 'precious pearl which grants all desires.'"