To dream of the gravestone means that there is an end to some phase in your waking life. To get more detailed dream interpretation, please see the meaning of death.
Dream dictionary: Gravestone dream meanings
Additionally, read the interpretation about headstone.
To have interaction with a headstone or to encounter tombstone or to see a gravestone, when you are dreaming, then such dream has the symbolic significance of forgetfulness. Headstone in the dream indicates aspects of yourself which you need to accept. Maybe you have buried these qualities of yourself which you need to acknowledge. The message on the gravestone also is important. You should consider what is written on it. This message may indicate a statement about conditions of your current life. Also it can be something from your past. Or it is message from the future.
…Seeing one’s picture on a wall in a dream means one’s death and that his name will be itched on a gravestone. (Also see Paintings)…
…Seeing one’s picture reflected in a wall means his death, and connotes that his name will be itched on his gravestone….
…tears it down in a dream, it means that he will attempt at destroying someone’s livelihood, or perhaps kill him. If one sees and recognizes a wall in his dream, it represents a close friend who may die from depression. A wall in a dream is also interpreted as a mighty person who cannot be managed except through kindness. Jumping over a wall in a dream means reverting from being a believer to a disbeliever, or accepting and following the advice of a disbeliever. Seeing one’s picture reflected in a wall in a dream means one’s death, and that his name will be itched on his gravestone. If a traveller sees himself returning to his house, whereby its walls are renewed, it means that he will get married. Seeping water from a crack in a wall in one’s dream means adversities and stress. (Also see Walls of the city)…