Here is a list of suggested readings on Jewelry Design recommended by L'Ecole Van Cleef Arpels a Jewelry School at Place Vendome Paris after I took their classes and I personally read each one of them and learned tremendously as a self taught designer.
This is the Library at the Jewelry School in Paris
Three Volume Book Set ( Click on the title for Amazon purchase link)
More coming, stay tuned!
One of the Sketches by Van Cleef & Arpels High Jewelry at the School.