Diamonds exhibit both reflection and refraction, but they are primarily known for their remarkable refractive properties.
Reflection occurs when light bounces off the surface of a diamond, while refraction takes place when light passes into the diamond and bends due to the change in medium. The unique way a diamond is cut enhances both of these properties.
Beneath the surface, when light enters a diamond, it slows down and changes direction, creating the stunning sparkle and brilliance that diamonds are famous for. This bending of light is responsible for the many colors and flashes of light that you see when looking at a diamond from different angles.
In summary, while diamonds do reflect light, their ability to refract it is what truly makes them stand out and captivates observers.