IGI DIamond Certification
The International Gemological Institute (IGI), founded in 1975, stands as the largest independent gemological laboratory globally, operating in key diamond trade cities worldwide.
IGI Diamond Grading Standards
A team of experienced gemologists, supported by state-of-the-art equipment, conducts a scientific analysis of each diamond to provide an accurate and detailed description of its characteristics and the quality of its cut.
- Diamond Carat The carat weight and measurements of the diamond are precisely determined using meticulously calibrated instruments.
- Diamond Color The diamond’s color is evaluated on a scale ranging from D (colorless) to Z (yellow), by comparing it to standardized master stones with predetermined colors. Additionally, the level of fluorescence is assessed and recorded on a scale from None to Strong.
- Diamond Clarity An expert gemologist assesses the diamond’s clarity using a specialized scope and a 10x magnification loupe. Clarity is rated on a scale that ranges from IF (internally flawless) to I3 (imperfect or heavily included). The gemologist plots the diamond’s characteristics on a diamond diagram.
- Finish The finish of a diamond includes factors such as polish, symmetry, and proportions. Polish and symmetry are assigned grades from Excellent to Poor, based on the quality of the polish and the precision of the cutting details. Proportions are evaluated by considering elements like table diameter, crown height, pavilion depth, girdle thickness, and culet size, and are also assigned grades from Excellent to Poor.
Brief History of IGI
A team of gemologists scientifically examines each diamond, utilizing cutting-edge equipment and their collective expertise to provide an accurate description of the diamond’s characteristics and the quality of its cut.
Discover additional information about the diamond reports issued by the IGI in the following section.
IGI Diamond Grading Report
This report provides a detailed analysis of a diamond’s characteristics, including carat weight, color, clarity, polish and symmetry, and proportions. It also includes a diamond diagram illustrating the plotted clarity characteristics.
IGI Diamond ID Report
This report includes all the information provided in the Diamond Report, along with a laser inscription of a unique identification number on the diamond. The inscription helps to verify the authenticity and traceability of the diamond.