Here are most of the components my jewels are made of:
They are exquisite glass beads made on the island(s) of Murano near Venice. Murano glass has been made since the 13th century when the factory was moved from Venice to the islands (there are 5 of them) to protect the secret of intricately glass making from spies searching for beauty and, also, to protect both the city and the factory from fire. The beads are handmade with the artist sometimes using a lamp-work technique: the glass is thrust on a metal rod/mandrel, the little lump of glass is then heated and melted by a torch/lamp in the desired shape, an air pump helps the marvel to happen, sometimes with added layers of silver and gold leaf/foil and bits of other coloured glass added for the final touch.
I use fresh water pearls for my jewelry. They are not as expensive as sea water ones, but they are fine, shiny and long lasting. The reasons for which sea water pearls (oyster pearls) are so pricey are that they grow in the wild and the layers of nacre (mother of pearl) are thicker. The fresh water pearls my necklaces are made of are all farmed and come from China.