What phenomenon is referred to as "milk and honey" in gemstones?

The phenomenon referred to as "milk and honey" in gemstones describes a dual color effect that occurs in certain chatoyant gems when they are oriented correctly. This effect is often observed in stones like cat's eye, where the optical phenomenon results from the reflection of light off of parallel inclusions within the gemstone. When viewed from the right angle, these stones can exhibit a milky appearance alongside a honey-like tone, creating a striking visual contrast. The name "milk and honey" effectively captures the essence of the light and color interplay, enhancing the gem's overall aesthetic appeal.

This particular phenomenon is distinct and specific to the visual qualities of chatoyant stones, emphasizing the importance of orientation for maximizing the visual effect. Other choices do not accurately describe this unique optical effect, focusing instead on processes or characteristics that do not relate to the specific light-play observed in chatoyancy.