Laurence Graff was only 14 years old when he dropped out of school to work as a jeweler’s apprentice. Six decades later, the London-born diamond purveyor purchases record-setting stones at auction and helms an international jewelry empire that trades the world’s most expensive diamonds. And now Graff’s fascinating rags-to-riches story is available in his first book, Graff—a 272-page coffee-table book ($95) released by Rizzoli International Publications on October 27. Written by leading journalists and jewelry …