Abstract: An apparatus and method for individual psychological diagnosis and treatment are disclosed, the diagnosis being Based on the theory of vibrations or frequencies of colors and the treatment being based on the theory of Bach Flower essences. The apparatus includes a plurality of cards (10) each having a first (100) and second (200) side. The first sides (100) of the cards (10) include three spaced apart, equal sized spheres colored with preferably one or two colors. The second sides (200) of the cards (10) include at least an image of a flowering plant (204). The method of the invention involves presenting the first sides (100) of the cards (10) to a person being assessed, reviewing the cards selected by the person based on the person's review of the colored spheres, and then providing a treatment regime based on the flower (204) depicted on the second sides of the selected cards.