PURPOSE: To improve texture of natural stone by crushing a multilayer molded piece made of un-hardened liquid hardening resin having different color tone and mixing it in transparent hardening resin liquid so as to mold by hardening.

CONSTITUTION: A multilayer structure is formed by coloring with different color tone and using un-hardened liquid hardening resin, for example, unsaturated polyester resin. For example, a first color layer 1, a second color layer 2, and a third color layer 3 are respectively molded by hardening in multilayer with thickness about 0.1-2.0mm. In this case, the layers 1-3 are colored optionally with TiO2, yellow toner and the like. Also, filler such as aluminum hydroxide having about 5μm - severalμm particle diameter may be added. This multilayer structure is crushed by a crushing roll and pieces having about 0.5-10mm diameter are classified. The crushed resin elements are mixed in transparent hardening liquid resin such as acrylic syrup, dispersed, and molded by hardening.