In shape no bigger than an agate-stone
According to believers the agates attract strength, it is a protection from bad dreams, protects from stress and energy drains.
An finished Agate Stone has a pearly, glossy feel to it
Also: agate-stones are typically rather small, so this line also just explains how tiny Queen Mab is.
To help improve the meaning of these lyrics, visit "Queen Mab Speech" by William Shakespeare (Ft. Mercutio) Lyrics and leave a comment on the lyrics box