The flat shape of a lasque diamond makes it suitable for a watch crystal, which is what Patek Philippe did with a 13.43 carat lasque diamond in the early 1990s. https://www.makingwatches.com/ wdf replica As the story goes, the flat diamond was handed over to the Geneva watchmaker in 1990 by an anonymous client (in fact, industry lore has it there was more than one such diamond).