A very well known magazine is the German GZ, which is a very good magazine, but of course its in German language. But the same Editor has published a lot of english books. Have a look at "http://www.gz-shop.de"
Another famous book in German language is:
"Theorie und Praxis des Goldschmiedes"
The book from Carles Codina has a lot of pictures and is called: "Schmuckwerkstatt"
In the Internet you find "BeyArs.com" which includes a large encyclopedia about terms for jewellery