Identifying authentic Lalique pieces involves locating specific signature etchings, molded marks, or acid-stamped signatures etched into the glass surface, which changed across different operational eras (such as script "R. Lalique" signatures for vintage pieces or "Cristal Lalique France" stamps for later works). Collectors also examine the weight, exquisite molding detail, characteristic contrast between polished clear surfaces and velvety frosted (satin-finish) textures, and the flawless craftsmanship unique to genuine Alsatian manufacture.