There are two more unusual characteristics that may be observed in some cat's-eye materials. The first is known as the milk-and-honey effect. This is most commonly seen in chrysoberyl. When a light source is directed through the side of a stone, one half appears milky or creamy while the other half remains clear and unaffected. Reverse sides, and the effect remains the same, only the clear side is now milky and the milky side is clear.