This Silver and Gray Hematite Piano Wire Necklace creates interest with unconventional materials. A glossy mix of hematite squares and silver beads make a classically simple statement. Necklace has a magnetic snap closure.Our stunning collection of piano wire necklaces are a favorite at the New Mexico Museum of Art. Piano wire must seem an odd term when it comes to jewelry. The name is derived from only one of its many possible uses (namely, piano strings), but in fact, music wire is a versatile and affordable type of steel wire that is useful in a number of applications.