How does the specimen compare in color to other known examples? Vivid, bright, intense, and saturated in color are all positive qualities we want in a crystal. Typically, a more saturated and vivid color is more valuable and desirable. Minerals that are transparent can be less valuable if they are too dark and light does not transmit through the crystal. This criterion is somewhat relative, primarily due to the type of lighting when viewing the mineral. You will see differences in color when viewing specimens in daylight, incandescent light, halogen light, or fluorescent light. Color perception is directly related to lighting, but still measurable in relation to other known examples under the same lighting conditions.