It ' s definitely very unique , I just thought acid rap was more innovative for its time . They ' re both innovative and both great <| sep |> Your are misinformed in regards to the effect the general market has on the value of a diamond . You might not know this but 90 % of the worlds diamond supply is controlled by De Beers . Since the 1950 ' 60 ' s the company launched an ad campaign focused on the ideal that a man looking to propose must spend at least a months wages on a ring for their wife to be . This created an artificial demand for the product , and whenever the cost of value of diamonds go down the company will reduce the flow of diamonds into the market essentially driving the cost up again . Also the type of diamond they would use for diamond coated tools is would most likely be zircona which is more affordable .