What is the ruling on a woman describing another woman to her husband?

Question : May Allah reward you. The questioner says: It is established in the two Sahihs from the Prophet Does this hadith contain an indication or reference to covering the face for the woman?

Answer : It may be said that it contains evidence for the obligation of a woman covering her face, because if a woman exposes her face to people, they will look at her. As for the meaning of the hadith, the Prophet (peace and blessings be upon him) forbade a woman from describing another woman to her husband, saying for example, "Her face is round, her flesh is abundant, her eyes are black, her nose is straight, and her lips are thin," and so on, describing her as if he were looking at her. Why? Because his heart may become attached to her, and this may lead to immorality, especially if the woman being described is with her husband.
As for if the woman being described is with someone other than the husband, I do not think the wife would describe her to her husband. Why? She fears that he might go and marry her. But she may describe her to her husband if she is married, saying for example, "So-and-so's wife, what Allah willed, is a beautiful woman," and mentioning her beauty. This is not permissible because it leads to fitnah (trial, discord or temptation).