According to this http://www.huffingtonpost.com/ira-weissman/7-reasons-why-you-shouldn_b_1720870.html The De Beers company made a very intense marketing campaign to increase the demand of diamonds, along with many other bad tricks, in 1940's. So, what was the situation of diamonds before that? How much did a diamond cost? Were other gemstones more appreciated than diamonds? Did the wedding ring existed?