By Lulu DK, these charms express a range of sentiments with a gold plated disc on a wishbone setting. There are eight options from which to choose, all in the same design.
This sells for USD$68 at Nordstrom. Their site notes, “Deeply personal and sentimental, this glistening necklace is anchored with a circular pendant etched with a cryptic message that only becomes legible when the wearer gives the piece a quick spin. It is 16 1/4″ length; 2 1/2″ extender; 3/4″ L pendant.”