It is prohibited to see a non-Mahram woman as because of this a man’s heart starts leaning towards the non-Mahram woman. In this, there is a very strong possibility of trouble. In the same way, when a woman speaks about the beauty of a non-Mahram woman in front of her husband and describes the beauty of that lady, the man starts imagining and visualizing her.
That’s why the Holy Prophet (Sallallahu alaihi wa sallam) has prohibited women from meeting such a woman who mention their beauty before her own husband.
Translation of Hadith: It has been narrated on the authority of Abdullah bin Mas'ud (May Allah Ta'ala be well pleased with him) that he heard that the Holy Prophet (Sallallahu alaihi wa sallam) say: No woman should meet another woman with the intention that she mention (the other lady's) beauty before her own husband in such a detailed manner as if he is watching her. (Jame’ Tirmidhi, Hadith No. 2716)