I have thoroughly checked the schematics of Arduino Pro Mini from multiple sources and I count find any diode on the board.
Personally, I have one Chinese Clone of Arduino Pro Mini and I found that there is one mysterious component whose one end is connected to VCC and the other end is connected to the input of the voltage regulator. I confirmed these connections using a continuity test on a multimeter.
My guess is that it is a diode and uses to limit the direction of the current. See the picture attached.
Do you think I am right? its there any other use of this diode ?