These large hollow curved tubes are very popular in Venice and you'll find them in all the fancy stores in San Marco. 

Our lampworker who uses Borosilicate in Murano often joins with our blown bead maker to create these.  They are hollow but you need to begin from the center our, as it's easier.

They require 2 pieces, one which is shorter (all colors) and the longer black one. Use your creativity to design a very "one-of-a-kind" piece. Visit our Design Center for Free Instructions for this necklace.