GCI Gemological Centers • Diamond & Gemstone Certification Services
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Laboratory Offerings

Gemological Certification Services

GCI Gemological Centers provides structured diamond grading, gemstone identification, and jewelry documentation services.

Diamond Grading Reports

Evaluation of diamonds assessing the fundamental 4Cs: Carat Weight, Color Grade, Clarity Grade, and Cut proportions, along with detailed measurements.

Key Features:

  • Carat Weight and Measurement Recording
  • Color Grade Classification on Standard Scales
  • Clarity Grade Assessment and Inclusions Summary
  • Cut Proportions and Finish Analysis

Colored Gemstone Identification

Laboratory analysis of precious and semi-precious colored gemstones to determine mineral species, physical properties, and notable optical characteristics.

Key Features:

  • Species and Variety Identification
  • Physical and Optical Property Documentation
  • Color Description and Measurement Details
  • Comprehensive Gemstone Laboratory Summary

Fine Jewelry Reports

Evaluation and documentation of finished jewelry items, recording metal characteristics, total piece weight, and mounted gemstone attributes.

Key Features:

  • Total Finished Item Weight and Description
  • Mounted Diamond and Gemstone Summary
  • Precious Metal Identification
  • Official Laboratory Reference Report

Need to Verify an Official GCI Certificate?

Use our central certificate verification portal to validate report details online.