Why are metals used for making jewellery and non metals not....”............

Metals are stronger, ductile( can be drawn into wires) malleable ( flexible and can be beaten into thin sheets) and are not brittle(which break on applying pressure) unlike non metals which are weaker, neither ductile nor malleable, brittleand hence cannot be given the required shapes for designing jewellery. Moreover metals are lustrous while non metals are not.

Non metals are generally non ductile and very soft .......metals are ductile and used for making thin wires used in making ornaments