One way of looking at how well you spent your money on an item is to divide the total cost you spent on the item by the number of days you've ever had the item.

For example, if you spent $365 on an item and have had it for a year, that means you paid $1 a day for having it so far. In two years time, if the item is still good, you'll have paid $.50 a day for having it so far, and so on.

Do this for every significant item in your possession, including clothes, and decide how satisfied or unsatisfied you are with having parted with your money.

And then know that diamonds are forever.