For lapidary, the is kinda thin. You can research
on Idar Oberstein. They’ve been cutting stones there
since the 14th century. For historical documents, there’s The
Treatises of Benvenuto Cellini on Goldsmithing and Sculpture (ISBN
0-486-21568), written in the mid 1500’s, The Pirotechnia (ISBN
0-486-26134), On Divers Arts (ISBN 0-486-23784) (which at the 11th
century predates the era you are looking at by a lot, but has a very
good description of the setup of a medieval workshop).
If you can find it, Medieval Craftsmen: Goldsmiths by John Cherry
(ISBN 0-8020-7711-0) has a lot of illustrations of jewelers shops
from the 1500s and 1600s.
There are a few more, but some of them are esoteric and kinda hard
to find. The stuff I listed above, and the bibliographies they
contain should get you further along than you are.
Ron Charlotte – Gainesville, FL