Diamonds are actually quite rare in the past but not any more. While it's true that the process of extracting diamond is quite laborious (mines move many tons of dirt per carat of diamond found) and that gem-quality diamonds are relatively few (only about 1 in 1 million diamonds are quality one carat stones, only 1 in 5 million are 2-carat; and 1 in 15 million are 3-carat), diamonds are not rare in an economic sense because supply exceeds demand.
To maintain the high prices of diamonds, De Beers creates an artificial scarcity: they stockpile mined diamonds and sell them in small amounts.
Perhaps De Beers chairman Nicky Oppenheimer said it best: "diamonds are intrinsically worthless, except for the deep psychological need they fill." (mental_floss, vol 7 issue 6, p. 21 "Diamond Engagement Rings" by Rebecca Zerzan)
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