Silver coin proof quality 1 ounce. Ag 999/1000, weight 31.10g, diameter 40mm. Chinese Panda gold and silver coins have become one of the major investment coins in the world coin market. They are characterized not only by their investability but also their collectability for the design of Panda coin change every year, which increases the artistic attraction and collective value of the coin. Panda coin is one of China’s most important coin programs each year.