For Design Professionals

Our goal is to provide Natural Stone Institute members—and the stone industry at large—with the tools they need to ensure due diligence on all workplace safety-related matters, including forced labor. We set the standards for supporting safe and sustainable work practices through our third-party verified Natural Stone Sustainability Standard (NSI/ANSI 373) and the NSI Accreditation program.

Third-Party Verified NSI Credentialing Programs

Natural Stone Sustainability Standard (ANIS/NSI 373)

Certification to the Natural Stone Sustainability Standard is the ultimate validation of responsible and sustainable production practices in the natural stone industry. Learn more here.

Find Certified Companies
Source Certified Stone


Companies who achieve Natural Stone Institute Accreditation have proven themselves best-in-class for fabrication and installation methods in their respective disciplines. Learn more here.

Find an Accredited fabricator or installer in your area

Additional Resources on Preventing Forced Labor in Supply Chains:

Design for Freedom

A movement bringing industry leaders together to eliminate forced labor in building materials supply chains, create true market transformation, and build a more equitable future.

Design for Freedom Toolkit

Ethical Stone Register

An online tool designed to provide a single source point for ethically and responsibly sourced natural stone.

About the ESR
Member companies

Ethical Trading Initiative

A leading alliance of companies, trade unions, and NGOs that promotes respect for workers’ rights around the globe.

ETI Guide to Ethical Stone Sourcing
ETI Guide to Buying Responsibly

TruStone Initiative

An effort by the natural stone sector in Flanders and the Netherland to tackle the issue of human rights and labor violations in the natural stone industry.

About the TruStone Initiative
Guidance on addressing child labor in the stone industry


Use Natural Stone

Genuine. Versatile. Unique. Durable. Sustainable. Easy to Maintain.