OSSIDO DURO DI ALLUMINIO ED AL TITANIO PER FARE GIOIELLI CON METALLI PREZIOSI, PIETRE DURE E/O DIAMANTI

摘要

A manufactured product for jewelry and/or costume jewelry, which comprises a jewel made in aluminium with at least one portion of its surface coated with a layer of at least either hard aluminium oxide or hard titanium oxides.