The British museum has a few pieces of art from Nepal, mostly dating 18-19 century. The most impressive from my point of view is this altar screen of metal set with bone, shell, precious and semi-precious stones (18-19c).
And this is a ritual dagger, "phurbu", of bronze, gilt-bronze and semi-precious stones, 19c
Daggers with multi-headed handles and with the blade issuing from the mouth of a sea-monster, are used in rituals of Himalayan Buddhism to lay out sacred diagrams, mandalas, and also to ward off evil spirits.
Ornamental plaque 18-19c. The figure carved in bone at the centre of the plaque is Garuda, bird-mount of the god Vishnu.
Vishnu-Garuda earrings, 18c
Stupa with rock crystal dome, bronze, 17 century
Bodhirattva avalokiteshvara, bronze, 16 century
Samwara and Vajravarahi, 19c