Japanese glassware maker Hario created a violin out of a very thin, heat-resistant glass. Photos of Japanese violinist Ikuko Kawai holding and playing the instrument are available from Getty Images archive. I couldn’t find any details on the glass violin other than these photos (perhaps because I can’t read Japanese). It appears that the bridge is wood, and the pegs and chinrest are either dark glass or the usual dark wood. The tailpiece, however, is clear glass.