Originally this disc may have had a pure white color. Time and possibly burial have added a yellowish hue which adds to its appeal. The reverse is especially interesting as it shows whirling petals which are very deeply carved into the material. We have not seen such deep-carving before. This type of flower is not depicted in professor Cheng Te-k’un’s book ‘Jade Flowers and Floral Patterns in Chinese Decorative Art ‘.