Carnelian gives you motivation and is uplifting. It stimulates your self-confidence and attracts success. It is a very positive stone and can help with depressions. It protects against negativity, bad emotions and stress. It also helps against spring fatigue. Carnelian stimulates the creative process and can help you to turn ideas into reality.
Carnelian can discolor when left in bright sunlight, but it can be cleansed and charged in every other way. Here I explain more about cleansing and here about charging crystals. :)