The water diamond paradox was firstly resolved with the help of:

The paradox of value (also known as the diamond-water paradox) is the apparent contradiction that, although water is on the whole more useful, in terms of survival, than diamonds, diamonds command a higher price in the market. The philosopher Adam Smith is often considered to be the classic presenter of this paradox The real price of every thing, what every thing really costs to the man who wants to acquire it, is the toil and trouble of acquiring it. Hence, Smith denied a necessary relationship between price and utility. Price on this view was related to a factor of production (namely, labor) and not to the point of view of the consumer. Proponents of the labor theory of value saw that as the resolution of the paradox. The labor theory of value has lost popularity in mainstream economics and has been replaced by the theory of marginal utility.