Whether purchasing a natural diamond, lab grown diamond, emerald, sapphire, ruby, or finished jewelry piece, certification helps consumers and professionals make informed decisions.
Independent grading reports provide objective information about quality, authenticity, treatments, and value factors, making certification one of the most important considerations when buying, selling, or insuring gemstones and jewelry.
With 31 laboratories and 18 schools in 10 countries, IGI employs a global workforce of experts and educators dedicated to industry service and consumer protection.
IGI’s supreme position in the gemological world is no coincidence. It is the result of continuous research, support, and synergy with professionals and consumers alike. This dedication is reflected by worldwide trust for IGI certified diamonds and IGI certified gemstones, which uphold the highest industry standards.
Why Diamond and Gemstone Certification Matters
>Independent certification provides a standardized way to evaluate diamonds, gemstones, and jewelry. A professional grading report documents characteristics that influence quality and value, helping buyers compare stones with greater confidence.
For diamonds, certification evaluates the internationally recognized 4Cs: cut, clarity, color, and carat weight. These factors play a significant role in determining diamond value and allow consumers to understand exactly what they are purchasing.
For colored gemstones such as emeralds, rubies, and sapphires, certification identifies species, variety, geographic origin when determinable, and any treatments that may affect value. Accurate gemstone certification provides transparency and supports informed purchasing decisions throughout the jewelry marketplace.
IGI reports
IGI grading reports play an essential role in the global diamond, gem, and jewelry market, serving as the common language of trust and confidence in the gemological world.
Colored Stone Report
IGI analyzes every gemstone to identify species and variety, provide detailed information, and disclose any treatments present, ensuring the integrity of IGI certified gemstones for consumers.
Jewelry Report
IGI pioneered grading reports for finished jewelry, providing peace of mind for millions of consumers who purchase jewelry every day, at a much higher frequency than loose diamonds or gemstones.
Diamond Reports
IGI’s loose diamond reports clearly identify natural or lab-grown origin and document all aspects of the diamond’s value-setting 4Cs. With IGI certified diamonds, consumers are assured of quality and authenticity.
IGI Education
Offering more courses in more locations around the world, IGI’s
schools of gemology
are unrivaled in diversity and reach, offered in-person and online via
customizable webinars and eLearning programs.
The value of a diamond or colored gemstone is influenced by multiple factors,
including rarity, quality characteristics, treatments, market demand, and
overall condition.
Certification does not assign a price to a stone, but it provides the
independent grading information used by consumers, jewelers, insurers,
and appraisers when evaluating value.
IGI’s consumer education resources help shoppers understand how grading
standards work, what affects diamond value, how gemstone quality is assessed,
and why independent certification remains an important part of the buying process.
Available Courses
