One of the "Eight Precious Objects", symbol of victory and success. A rhombus or diamond shape of four sides that is often found as a pattern in carpets, as well as on other decorative objects.
The double-lozenge, also known as fang sheng, is one of the Eight Treasures, babao, which was a much favored motif used in decorations during the Ming and Qing dynasties. Lozenge-shaped lacquer boxes first appeared in Ming dynasty. The inspiration from previous generations was in line with the Qianlong emperor's instructions to his court and craftsmen to look to China's past for moral guidance and artistic inspiration.