Lapis lazuli, also known as "Rukia", refers to the use of various colors of artificial crystal (containing 24% lead dioxide) as raw materials, using ancient bronze dewaxing casting method of high temperature dewaxing and crystal works. Its color is flowing clouds, beautiful; its quality is crystal clear, brilliant. This process requires dozens of carefully hand-operated to complete, the slightest negligence can cause failure or defects.

Anciently known as displaced, Liuli, lapis lazuli, etc., the ancients of man-made and natural gemstones, material ware, glassware, etc., called Liuli, with the development of ancient pottery and the production of porcelain, Liuli as a derivative of traditional Chinese ceramics, a large number of applications in the construction of decorative later, after thousands of years and gradually become a special term.

Today's so-called "glaze", the material is actually glass raw materials plus lead oxide into the "crystal glass". When the proportion of lead oxide reaches about 24%, the transmittance and refraction of the glass are higher, suitable for making fine art. Adding different types and amounts of metal oxides to the glass material can give different colors, such as adding manganese to give a purple color and adding cobalt to give a green color. Today we see the crystal clear, the shape of the dynamic works of glaze, are based on crystal glass as raw material, to dewaxing fine casting method of manufacturing works of art. It is not handmade