We’ve all heard about the traditional guideline of spending three months’ pay for an engagement ring. However, this guideline seems no longer relevant, as 61% of respondents to a recent survey believe it is outdated, particularly in light of the current economy. The idea of spending three months’ salary on an engagement ring started in the 1930s as part of a smart marketing campaign by De Beers, a diamond company trying to increase sales during the Great Depression. Don’t Miss: Are you richer than most people you know?Here’s the net worth you need at every age to be above average.Can you guess…