Pearl is the Birthstone for the following months: June, July & November Power-Stone for the following months: July The pearl is the oldest known gem, and for many centuries it was considered the most valuable. Unlike all gems, the pearl is organic matter derived from a living creature - oysters and mollusks. There is much folklore and tradition about the pearl. In fact so much history accompanies this stone that five months claim it as a birthstone - February, April, June (traditional), July and November.