I think in this field principless are the same standards of size, weight, and production methods, ston setting, etc. Because they still need craftsmanship rather than theoretical bases....
Being a part of accessories, jewelry design styles partly has interwoven with the same styles seen in fashion apparel, not being separeted styles, so, fashion theories and fundamentals would applied to this context as well.
If be possible to find the full text version, these are suggested:
One of the research that you can find is at Industrial Design Centre (or IDC School of Design at IIT Bombay). Parag Vyas has done an amazing work on the principles of jewellery design from India.