Participating companies

This page lists participating companies conform their purchasing situation and level of Due Diligence, also including the date on which they entered the TruStone agreement.

Assessment framework

More information: beoordelingskader-trustone-2025-2026 (Dutch only)

The assessment framework describes the due diligence requirements that importing companies must meet. Based on an independent assessment, companies are categorized by purchasing situation and level.

The initiative distinguishes three purchasing situations. Category A purchases only from Dutch and Flemish suppliers. Category B imports only materials extracted and processed in the European Economic Area. Category C imports materials from high-risk countries.

Companies in categories B and C are independently assessed and on the basis of this assessment assigned a level. The assessment considers factors such as the company's size, its position in the supply chain, and the number of years it has been a member. The assessment is based on information provided by companies themselves. Verification of the information provided is possible. Companies in levels 1 through 3 are assessed annually. Companies in levels 4 and 5 are assessed every two years.

A. Associate members:

• do not import from high-risk countries themselves;
• endorse the objectives of the TruStone Initiative;
• inform their Dutch and Flemish suppliers of their participation in the initiative and its significance;
• are not assessed.

Members:

• Aries Natuursteen
• Buddingh Natuursteen
• Steenhouwerij Bus
• Lavertu Steenhouwers
• Van Leeuwen Natuursteen
• Memorinda-Natubouw
• Jan Reek natuursteen

B. Importers of European materials:

• Import only materials that have been extracted and processed in the European Economic Area;
• Inquire with their suppliers about the origin of materials;
• Report on this to the independent secretariat;
• Are assessed on the following due diligence steps: 1. Policy; 2. Insight into the origin of materials; 5. Public communication.

C. Importers of materials from high-risk countries:

• Import materials from high-risk countries;
• Inquire with their suppliers about the origin of materials and investigate the conditions of extraction and processing;
• Develop an action plan aimed at improving conditions;
• Receive support in its implementation from the independent secretariat and affiliated parties;
• Are assessed on all due diligence steps: 1. Policy; 2. Insight into origin and conditions; 3. Contributions to improvements; 4. Monitoring progress; 5. Public communication; 6. Access to remediation and redress.