Official Publication
The 2026 First Edition
The governing publication for official natural turquoise grading: methodology, Master Stones, reports, registry, governance, future development, limitations, and glossary.
What Is Inside
01
Methodology
Purpose, scope, grading conditions, order of operations, and the official grading system.
02
Attributes
Color grading, Matrix and flawlessness grading, Zat grading, demerits, size, and cut.
03
Records
Uses, reports, registry, certification, governance, future development, limitations, and definitions.
Why the Edition Matters
Official grades are issued only through procedures established by the current edition. The 2026 First Edition marks the transition from a proposed methodology into a governed standard following the original four-year review and development program.