There is some­thing to be said for ver­sa­til­ity in jew­elry. The dress clip makes this case. Pop­u­lar from the 1920s through the 1950s, these prac­ti­cal sparklers could be found in almost any metal and motif and were com­monly designed in two parts so that they could be worn as a sin­gle orna­ment, or sep­a­rate, mirror-image coor­di­nates.  What they do for the neck­line — or back­line — of  black dress can­not be overstated.