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Monthly Brief: GIA Updates Colored Stone Reports and Lab-Grown Terminology

September 1, 2026

Monthly Brief: GIA Updates Colored Stone Reports and Lab-Grown Terminology

GIA implements new reporting standards for colored stones and transitions away from natural diamond terminology for lab-grown reports.

Shift in Grading Documentation

The Gemological Institute of America (GIA) has initiated a major update to its gemological reports for colored stones, including rubies, sapphires, and emeralds. Simultaneously, the GIA is moving to end the use of natural diamond grading terms for laboratory-grown diamonds (LGDs) to create a clearer distinction between the two categories. This follows a broader industry trend, including the AGTA's recent requirement for members to use the term 'synthetic' for lab-grown gems.

Key Policy Changes:

  • Report Redesign: New colored stone reports will feature enhanced data on treatments and geographic origin where applicable.
  • Terminology Separation: By removing natural-specific terms from LGD reports, GIA aims to reduce consumer confusion regarding the inherent value and rarity of natural stones.
  • Market Alignment: These changes align with recent production data showing natural diamond supply at its lowest level since the 1980s.

Sources: GIA, GJEPC, National Jeweler

Mallard & Co.