Terracotta is made of a clay or silt matrix, a fluxing agent, and grog or bits of previously fired clay. Clays are the remnants of weathered rocks that are smaller than 2 microns. They are composted of silica and alumina. Kaolinite, halloysite, montmorillonite, illite and mica are all good types of clays for ceramic production. When mixed with water they create hydrous aluminum silica that is plastic and moldable. During the firing process the clays lose their water and become a hardened ceramic body.
Jewellery design has remained relatively constant over the years. The fundamental references, production techniques, and materials from ages ago are still being used to this day. Yet the recent rapid developments in technology and machinery have allowed artists easier alternatives to some of the old methods. These advancements have also transformed the significance and social weight jewellery holds.