The phrase "apple of one's eye" is commonly used to describe someone or something that is deeply cherished, loved, or valued by a person. Though it is a charming expression, there are plenty of alternative synonyms that convey similar emotions. Some of these include "treasure," "darling," "beloved," "dearest," "cherished," and "precious." Other synonyms include "pet," "favorite," "prized possession," "heartbeat," and "soulmate." Each of these words can be used in different situations depending on the context and relationship involved. However, they all share one common characteristic; they express deep affection and attachment.