The diamond stands for the purest Water and the cleansed Earth.
It is a symbol of the wholeness of the soul, of clarity and that which is particularly valuable. Whoever possesses the diamond can, according to Buddhist beliefs, withstand all temptations. On the other hand, this dream symbol also points to vanity (as with all jewelry), to unnecessary harshness and being cold and distant.
If you see transparent diamonds in your dream it is a message to honor—without reservation—your own self, in spite of all shortcomings. You might want to ask yourself if you possess enough clarity and strength in your life.
According to Physiologus, one of the most widely read books of the Middle Ages, the diamond is a sun stone that can be found only during the night and that wont melt when placed in fire.
According to Jung, the highest development of the earthly body (the resurrected body).