This game...

Doesn't it not have a birthday system? This is just me rambling, so please don't mind, but I'd be happy if the code names of the 'Ten Stonehearts' were the same as their actual birthdays... To give a specific example, Aventurine = Dyne seems to be October 15th. Other gems have various types, so I don't know which one to set as the birthday... (like Opal)