Well i've jumped ahead and tried to look for diamonds (i think the easier way might be through achievements or so ?)

Because currently i've found 2 values but they change from adding the 2 values together then removing it from the total number for 1 diamond, or it picking one of the 2 values, or it multiplying the value by 2 and adding +1 .

Haven't found a set path in it neither yet because i've currently stopped at 10 spendings