This is actually rather unusual, as only a few carved stones are known to mark burial sites. It is possible of course that the stone was carved well before the burial, and simply reused as a convenient grave marker.
Unlike many carved Pictish stones, the Picardy Stone carvings are easy to decipher. At the top of the stone is a double disc and z-rod, above a serpent and z-rod. At the bottom is a mirror symbol. The double disc and z-rod is by far the easiest symbol to make out, but the serpent is also easy to see.
There are several other Pictish sites in the area, including another Pictish symbol stone at Inverurie (Brandsbutt), and the stone is within sight of the Iron Age hillfort and castle of Dunnideer.