Method Casting provides the optional added service of assaying pieces of jewellery. This is possible thanks to an alliance with WaarborgHolland. It is an independent assay office authorized by the Dutch Ministry of Economic Affairs to assay precious metals. This assay guarantees that the precious metals meet the legal requirements of both the Dutch and European market. WaarborgHolland is one of the few assay offices in the Netherlands that is ISO/IEC 17025 certified for laboratories and ISO/IEC 17030 for inspection institutes. It is accredited by the Netherlands Council for Accreditation for its working method and independence.