Traditional Korean Granulation: Shilla and Gaya The above examples are gold earrings from the Three Kingdoms Period, when ancient gold work was at its peak in Korea (around 400–550 AD). It is presumed the earrings were only worn by upper-class citizens and were hung by thread from crowns or hats rather than from the ear. The forms evolved over time from thin solid rings to thick hollow ones, and also from small and simple designs to large ones with decorative filigree and granulation. Locket Process Granulation: Traditional Granulation: Contemporary Credits