IGI is a leading diamond certification organisation that was established in 1975. With offices in over 40 countries, IGI has a global presence and is recognized as one of the top diamond certification organisations in the world.
IGI uses a combination of advanced technologies and human expertise to evaluate diamonds and issue diamond reports. 

Some of the technologies used by IGI include:

• Microscopy: IGI uses high-powered microscopes to examine diamonds for inclusions and blemishes, as well as to evaluate the cut and symmetry of the diamond.
• Spectrophotometry: IGI uses spectrophotometry to measure the colour of diamonds and determine their colour grade.
• Computer-Aided Technology: IGI uses advanced computer-aided technology to evaluate the proportions, symmetry, and polish of diamonds, providing a more accurate and detailed assessment of these important factors.
  

The IGI Diamond Report provides a comprehensive evaluation of a diamond's characteristics and is widely recognized and trusted by consumers and industry professionals. 

The report format includes the following information:

• Diamond Carat Weight: The weight of the diamond, typically expressed in carats.
• Cut Grade: The quality of the diamond's cut, including its proportions, symmetry, and brightness.
• Clarity Grade: The presence of internal and external imperfections in the diamond, known as inclusions and blemishes.
• Colour Grade: The colour of the diamond is determined using spectrophotometry.
• Plotting Diagram: A diagram that shows the location and size of any inclusions and blemishes within the diamond.
• Microscope Photograph: A photograph of the diamond taken through a microscope, which provides a detailed view of its internal and external characteristics.
• Identification Number: A unique identification number that is engraved on the girdle of the diamond and corresponds to the information on the report.
  

Overall, the IGI Diamond Report provides a thorough evaluation of a diamond's characteristics and is considered a reliable and trustworthy source of information for consumers and industry professionals.