There are prizes for this kind of thing, but the quality is very questionable, because things like jewelry are easy to fake. Take jadeite as an example. Two jadeites with the same appearance are almost identical to those who don't understand, but in fact, these two jadeites are only tens of dollars, and the other one may be millions. Now many shopping malls are engaged in this kind of stunt of lottery discount. In fact, the price may still be expensive after the discount! So don't be greedy for such petty advantages.