Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Emerald in a dream indicates lawful money and a righteous son. Whoever wears it as a ring will attain martyrdom or authority.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Emerald indicates a brave man or a loyal friend. It indicates useful knowledge.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Emerald is interpreted as a righteous woman. Whoever sees that he owns one has befriended a noble man.