The difference between Chow Tai Fook's cost of 880 and 808 lies in the variety and quantity of gems. Jewelry in 880 yuan contains a certain number and grade of diamonds or other precious stones, and the purity of thousands of gold is 99.9%. Moreover, jewelry with a cost of 808 yuan is also inlaid with precious stones, but the quantity and types are relatively small, and the quality of diamonds or other precious stones is low.