The makers here divide by material, which is a useful way to start choosing. Italamp and Multiforme, in the Veneto, lead with glass. Terzani, in Florence, leads with chain, cast brass and crystal. Masiero, outside Venice, works in both. Decide whether the piece is about glass or about metal, and the maker follows.
Buying from a UK retailer means sterling prices with UK VAT included, and one point of contact for the specification, wiring and delivery. Certification differs by maker and is listed on each page.