I have had the pleasure of meeting Hans Meevis a terrific jeweler and instructor of jewel design and concepts. Hans has a blog with many tutorials any jeweler would enjoy. Check it out http://hansmeevis.blogspot.de/2012/10/further-plique-jour-experiments.html He is not afraid to experiment and push the limits!

Also on his site he shares an excellent demo on Plique a Jour!   http://www.meevis.com/jewelry-making-class-fairy.htm

Thank you, Hans for sharing!!!