PURPOSE: To obtain the noble metal plastic compsn. adequate for the manufacture of multicolor noble metal ornaments by mixing different noble metal pieces consisting of a noble metal different from the noble metal of the plastic compsn. consisting of the noble metal powder and a binder with this plastic compsn.

CONSTITUTION: The different noble metal pieces 1 (for example, Pt alloy, etc.) consisting of the noble metal different from the noble metal of the noble metal plastic compsn. 2 and having the volume larger than the volume of above- mentioned noble metal compsn mixed with the above-mentioned noble metal plastic compsn. consisting of the noble metal powder (for example, Au powder, etc., having about ≤50μ average grain size) and the binder. The adequate compsn. of the binder is constituted of water-soluble binders of a cellulose system (methyl cellulose, etc.), surfactants (alkyl benzene sulfonate, etc.), fats and oils (phthalic acid-di-2-ethyl hexyl, etc.) or alcohols (polyvinyl alcohol, etc.) and water. The above-mentioned mixture is then molded to a prescribed shape and is calcined, by which the multicolor ornaments dispersed with the parts consisting of the different noble metal pieces 1 in the substrate parts 3 consisting of the noble metal powder are obtd.