The colorful stone are philosopher stone (PS) for gacha
And the bluish one are the alchemy stone (AS)(iirc, i think they change the name), for trading item at the mall
And here lies the problem.
well, the gacha change for the worst. Not by content, but by value. Now on, it's hard to get PS. The meaning to get stones only by grinding events (for now). I dunno what else players can do to get this free stones in the future. There is free 10 pull gacha, but it only around till the end of august, its unclear what will happened later. For the one this September, the free ten pull only last around 10 days before it completely gone. I dunno what happened, it may come back next month or may not at all. My heart bleeds for the newbies.
The daily and achievement reward change from PS to AS. The quantity are the problem. U can only get around 30 (iirc) AS from daily and achievement. It was bad because u need 6000 AS to exchange 1 armor or weapon ticket.