21. Industrial diamonds , mostly synthetic, are used for precision cutting and drilling, such as in oil wells.22. The case was filed in Columbus because GE's industrial diamond business was based in suburban Worthington. 23. In 1963, MIBA produced 80 percent of the world's industrial diamonds and 57 percent of all diamonds. 24. The case was filed in Columbus because GE's industrial diamond business was headquartered in suburban Worthington, Ohio. 25. GE contends that its Superabrasive division raised prices of industrial diamonds independent of pricing decisions by De Beers. 26. At the time Liotier was chief executive of the Belgium-based Diamant Boart SA, a buyer of industrial diamonds . 27. The indictment accused De Beers of violating the Sherman Antitrust Act by fixing the price of industrial diamonds . 28. During the meal, Liotier provided Frenz with a list of upcoming De Beers price increases for industrial diamonds . 29. Industrial diamonds are used to make cutting and polishing tools for a variety of manufacturing and construction equipment.30. In that year, the company produced just 1.4 million karats of diamonds, almost all of them industrial diamonds .