Once every seven days. According to relevant public information, qq Xuanwu 30 yuan Fund can get 600 diamonds immediately after purchasing on September 7th, September14th and September 2nd10th respectively. According to the calculation, it is once every seven days. Qq Xuanwu Mobile Games Fund costs RMB 30, and you can buy 100 ingots every day. In the game, if you want to get more diamonds, you must buy a growth fund.