"Bulkowski's (2005) research states that the diamond top breaks downward 69% of the time and the diamond bottom breaks upward 69% of the time. The majority (58%) of diamond tops are preceded by "a steeply rising trend", which increases the likelihood of a break downward and a mirror of the prior upward price movement (i.e. 82% of the time the downward move will be at least the same percentage move as the upward price move leading to the diamond top) (Kirkpatrick & Dahlquist, 2010, p. 321). Bulkowski (2005) emphasizes that a diamond bottom with a breakout move downward is ranked as being one the best performing patterns. " - finvids.com