After an initial period of receiving and imitating Chinese celadon production techniques, Goryeo celadon followed its own course of development from the eleventh to the early twelfth century, resulting in changes in the shapes and patterns of celadon, and various changes related to the construction of celadon kilns.

A new type of clay kiln emerged, replacing the Chinese-style brick kiln, and the number of firings was increased to two. Thus, celadon wares were baked lightly at a low temperature first, then coated with a thin glaze and baked again, thereby conferring a unique transparent effect on Goryeo celadon. This method led to the development of the famous jade-colored celadon.
The most representative celadon wares from this intense period of development are green celadon (low-grade celadon) and jade-colored celadon. Various decorative techniques were developed for celadon, such as the plain (pattern-less) style, intaglio carving (depressed engraving), relief carving (raised carving), impressed engraving in relief (i.e. the stamping of patterns on the surface of an object in relief), pictogram (patterns resembling the features of animals and plants), openwork (with a lotus, peony, or ring pattern of openings or holes on the sides of a bowl, usually used for chairs, pillows, etc.), and underglaze iron brown (i.e. the painting of patterns on the surface of an object with a brush dipped in iron pigment).