The magazine Stiletto asked master baker Eric Kayser to create the most precious bread of the world with jeweler Mauboussin. There are 7 carats hidden in this loaf. It will be sold from Monday 5 to Saturday 10 July 2010 in the Kayser bakery, newly installed Rue Danielle Casanova in Paris. During this week each visitor can try his luck in a competition by completing an entry form.