The largest player in this industry is comprised of companies such as the Central Selling Organization and the (*) Anglo-American Trust, many of which are owned by the Oppenheimer family.  
One titan in this industry killed himself in 1897 by jumping off a ship near Madeira yelling "They're after me!", and his son, Woolf Barnato, used the profits from this industry to found the Bentley Boys, a 1920s British racing team.  The UN's Fowler Report, released in 2000, concerned how companies in this industry violated the Lusaka Protocol.  This industry has controlled the sale of products made from chemical vapor deposition and high-pressure high-temperature methods.  The largest player in this industry is comprised of companies such as the Central Selling Organization and the (*) Anglo-American Trust, many of which are owned by the Oppenheimer family.  One of the chief sources for raw materials in this industry in the 19th century was the "Big Hole" in Kimberly.  A consolidated mining company in this industry was founded by Cecil Rhodes.  For 10 points, name this industry, dominated by a cartel including the De Beers company.
One titan in this industry killed himself in 1897 by jumping off a ship near Madeira yelling "
diamond industry [prompt on jewelry industry; prompt on gem industry] 