Striking Wavy Oval Blue Sardonyx Agate BeadsPrice is for 14. 5 inches of these knotted beads string. Size is 42mm x 32mm x 8mm ready to thread. There are 8 big oval beads in a string. Agate is one of the most common bead beader's use because it is readily available in an abundance of styles and shapes. What is agate? Agate is a variety of micro crystalline quartz that forms in layers and many colours and texture, by filling a cavity in a host rock although it is usually in round nodules with