Yeah really pisses me off to we went from getting 2 gold tickets below 90 and 1 diamond ticket 90+ to 1 gold ticket no matter what level take your soul stones back I rather have the diamond tickets.
I am sorry that you feel disappointed about this change but the rewards from the Mystic Ruins were updated. Diamond chest tickets are not available anymore but you can now get Aqua Soulstones from the Ruins.
All my diamond chest tickets got converted to gold chest. Why?