Source: The Great Interpretation of Dreams (Ibn Sirin)
A jewel in a dream indicates knowledge, the Quran, and a male child. A pure jewel indicates a sincere intention and a good deed.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A jewel indicates words of wisdom and good admonition. Whoever sees himself owning one will gain beneficial knowledge.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A jewel is interpreted as goodness and benefit. Whoever sees himself finding one will attain goodness.