During the 1960s, the manufacturing industry needed very little raw materials, and now it is basically not needed.

As far as I know, the most likely use now is to hit the reputation of Syndra (the reputation of the night elf in the 60-level copy of Doomsday Hammer), which probably takes 100. After worshipping this reputation and several other very strange reputations, it will give a brilliant achievement and get the title of "madman".

Because the original black diamond will only be dropped in three copies of level 60, almost no one goes now, so the output is very small. Because the demand is unstable and the price fluctuates greatly, I have bought all 5g~ 100g.