About one-third of the TruFaux Jewels collection is unsigned. Why is that? According to the late jewelry historian Christie Romero, costume jewelry wasn’t routinely signed until the late-1930s. For this reason, I don’t think unsigned pieces are any less desirable than signed ones. Shop for what you like. Where a piece is unsigned, I’ve given you my best answers for when/where it was made. Whenever, I’ve been able to attribute an unsigned piece to a specific maker, I’ve stated my reasons.