If you want something other than crystals in your game why not add another thing like diamonds or etc you name it.....
"ALTER TABLE users ADD `ucrystals` bigint(15) NOT NULL DEFAULT 0;
Open Header:
Find Crystals: {$ir['crystals']}
Add below
Name Here: {$ir['ucrystals']}
Then create a second crystal temple or something.
I know people maybe KNow how to do it but some people dont :)
Topic title editted ~LostOne