Diamond is used everywhere in tons of applications. It's especially useful in cutting and drilling of metal and stone. Although contra to the GP's point, indust

Diamond is used everywhere in tons of applications. It's especially useful in cutting and drilling of metal and stone. Although contra to the GP's point, industrial diamonds are in a completely separate market from gemstone diamonds and de beers' monopoly doesn't have much effect on that. You can find diamond tipped and coated tools at any local hardware store, for example, at quite reasonable prices.