I was sat on my bed when I noticed a flickering light through my blinds. I opened my window for a clearer look and what I saw shook me. It appeared to be a silver hovering diamond emitting purple and blue lights. The lights were blinking vigorously and continuously. I then noticed how this flickering craft which also had three bright white lights in a triangular formation seemed to slowly drift and ascend towards the left side of my view. Accompanied with this was an extreme feeling of fear, unease and paranoia. I felt an impending sense of doom, it was horrible. After around 30 minutes it disappeared.