The Gravestone Doji candlestick formation is composed of a single candlestick bar. A Doji is simply a print that has the exact same open and close. With the open and close being exactly the same, there is no real body. However, being a Gravestone Doji means, by definition, that the low is the same as the open and close, there is no lower body. If this prints at the top of an uptrend, with a very long upper body, this can be a very bearish signal.