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ANSI/NSC 373 Certificate

Material origin

A stone quarry or processing facility has been third-party certified to ANSI/NSC 373 for sustainable production of natural dimension stone — covering water, energy, site and habitat management, waste, worker health and safety, and community — at Bronze, Silver, Gold, or Platinum level, with a companion chain-of-custody standard linking certified stone to projects.

You might see it written as: ANSI/NSC 373 · NSC 373 Certified · Sustainable Production of Natural Dimension Stone · Natural Stone Sustainability Standard · NSC 373 Bronze · NSC 373 Silver · NSC 373 Gold · NSC 373 Platinum

Issued by: Natural Stone Institute (standard developer, with the Natural Stone Council) · NSF Certification LLC (certifier)

This entry is in review — facts are authored but not yet verified against current issuer documentation.

What it proves

A stone quarry or processing facility has been third-party certified to ANSI/NSC 373 for sustainable production of natural dimension stone — covering water, energy, site and habitat management, waste, worker health and safety, and community — at Bronze, Silver, Gold, or Platinum level, with a companion chain-of-custody standard linking certified stone to projects.

What it does not prove

  • That stone from the producer's non-certified quarries or facilities is covered.
  • Product performance, embodied carbon, or chemical-safety claims for the stone.
  • Certified-origin claims for a specific shipment without the chain-of-custody documentation.

Claims it can support

Evidence checklist

Minimum authority
Third-party verified
Should state
Facility Scope · Certification Level · Certificate Number · Valid Until
Date sensitivity
Expiry matters — check the certificate is current.

Certification applies per quarry or processing facility; the level (Bronze–Platinum) reflects points earned.

A separate chain-of-custody certificate is what connects certified stone to a specific project or product.

Source: Natural Stone Institute — Sustainability ↗