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International Gemological Institute


IGI provides comprehensive grading reports on natural and lab-grown diamonds, colored gemstones, and finished jewelry. Since 1975, IGI has been trusted by jewelry brands and retailers to deliver analysis, appraisals, and education that build value and costumer loyalty. NewYork@igi.org 212 753 7100


 Products

  • Colored Gemstone Reports
    The IGI Colored Stone Report identifies a natural colored gemstone’s species and variety. A detailed photograph is included, and the country of origin will be stated if gemological analysis conclusively reveals it. Clients who require more than 50 colored stone reports in a 12-month period can purchase a GemPass for convenience and favorable pricing. Email: newyork@igi.org Tel: 212 753 7100...

  • Diamond Grading Reports
    IGI Diamond Reports give an accurate assessment of a diamond’s cut, color, clarity, and carat weight according to strict international standards, supported by detailed diamond certification....

  • Jewelry Reports and Appraisals
    As an unbiased authority, IGI does not buy, sell, or trade gemstones or jewelry. Our ASA-accredited appraisers use real-time market data, value forecasts, and trends to ensure accurate valuations.  Any IGI grading report can include pricing to serve as an appraisal that can support insurance, estate tax, equitable distribution, market value, and financial auditing. Email: newyork@igi.org Tel: 212 753 7100...