bachingchung I'm be honest I'm not sure as I bought my 500 +the extra 200 last night but I've not seen the 515 stones as on yet and we did hit the 700 share before 15/5,
I'm in the web novel group myself and I'm going to ask about it there in a bit, when I get a reply I'll be happy pass on and to post too let you know, but as CKalon has posted in here,
he may well be in the best position to answer this question
but i did see ealier this morning someone did a screen pic showning the 515 stones , and I did share it to the FB reading go I help admin that is outside of webnovels FB group to make sure it got shared more , but as of yet i've not seen the extra stones myself