a method for fabricating a molding tool for mold glass optical elements therewith is taught . the method comprises the steps of figuring the molding tool to have a predetermined mold surface ; applying an attenuating coating to the predetermined mold surface ; implanting metal ions through the attenuating coating and into the predetermined mold surface ; and removing the attenuating coating leaving the predetermined mold surface with metal ions implanted therein . the method of fabrication allows for the molding tool made therewith to be used for molding optical elements from eco - glasses such as titania at high temperatures without generating adverse surface chemistry effects in the molded element