Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Ruby in a dream is joy, happiness, and knowledge. For a woman, it is a son. Whoever sees that he owns a ruby will gain knowledge and high status. A single ruby indicates a beautiful woman.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Ruby indicates wisdom and knowledge. Wearing it indicates prestige and dignity. Whoever finds a ruby will marry a righteous woman.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Ruby is interpreted as a beautiful woman or a righteous son. A red ruby indicates an adorned woman, and a yellow one indicates a sick woman.