Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with precious gems) A diamond in a dream may indicate the fleeting adornment of the world and vanity, or it indicates a beautiful, captivating woman, or abundant wealth.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) A diamond may indicate precious knowledge or a righteous child, but its sparkle may indicate strife.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) A diamond is interpreted as goodness, benefit, and adornment. Whoever sees one will attain joy and adornment.