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- Q5715583 subject Q10102489.
- Q5715583 subject Q8077342.
- Q5715583 subject Q8409151.
- Q5715583 subject Q8473683.
- Q5715583 abstract "Henri Lemoine (fl. 1905–1908) was a French fraudster who claimed to be able to produce synthetic diamonds.In 1905 Lemoine contacted Sir Julius Wernher, British banker and one of the governors of De Beers Diamond Mines. He said he had discovered a process to produce gem-sized diamonds from coal and agreed to sell his invention if Wernher would be willing to invest to further his research. He invited Wernher to his laboratory in Paris to witness the process. Wernher took Francis Oats, a De Beers executive, and two other associates with him.Lemoine invited his guests in and left the room; moments later he reappeared naked, to prove that he was not concealing any diamonds in his clothing. He mixed a number of substances including iron filings and coal into a small crucible, showed the mixture to his guests, and placed it into a furnace in the center of the room.After fifteen minutes, Lemoine removed the hot crucible and let it cool. Then he picked a pair of tweezers and took out about twenty small, well-formed diamonds. Oats examined the diamonds and demanded that Lemoine repeat the procedure. He did so successfully.Wernher offered to pay Lemoine to develop his invention if he would keep it a secret. Lemoine agreed and promised him an option to buy his secret formula, which he deposited in a London bank deposit box.For the next three years, Sir Julius sent Lemoine a total of £64,000. Lemoine promised to build a factory to duplicate diamonds; actually he just took a picture of an electric plant in southern France and sent it to Sir Julius.In 1908 a Persian jeweller revealed that he had sold Lemoine small diamonds that matched the description of the diamonds Lemoine had shown during the first demonstration. Lemoine was indicted for fraud.In court, Lemoine continued to claim that his process was genuine but was unable to duplicate it for the judges. The secret formula was unsealed by a court order; it was a mixture of powdered carbon and sugar. Before the court could agree on his guilt, Lemoine left the country for parts unknown.".
- Q5715583 wikiPageExternalLink affairelemoine.htm.
- Q5715583 wikiPageExternalLink regnier.htm.
- Q5715583 wikiPageWikiLink Q10102489.
- Q5715583 wikiPageWikiLink Q121842.
- Q5715583 wikiPageWikiLink Q1662249.
- Q5715583 wikiPageWikiLink Q24489.
- Q5715583 wikiPageWikiLink Q28813.
- Q5715583 wikiPageWikiLink Q390417.
- Q5715583 wikiPageWikiLink Q471891.
- Q5715583 wikiPageWikiLink Q5283.
- Q5715583 wikiPageWikiLink Q7199.
- Q5715583 wikiPageWikiLink Q751479.
- Q5715583 wikiPageWikiLink Q8077342.
- Q5715583 wikiPageWikiLink Q8409151.
- Q5715583 wikiPageWikiLink Q8473683.
- Q5715583 comment "Henri Lemoine (fl. 1905–1908) was a French fraudster who claimed to be able to produce synthetic diamonds.In 1905 Lemoine contacted Sir Julius Wernher, British banker and one of the governors of De Beers Diamond Mines. He said he had discovered a process to produce gem-sized diamonds from coal and agreed to sell his invention if Wernher would be willing to invest to further his research. He invited Wernher to his laboratory in Paris to witness the process.".
- Q5715583 label "Henri Lemoine (fraudster)".