The International Gemological Institute, commonly known as IGI, is a leading independent laboratory specializing in the grading and certification of diamonds and gemstones. When a diamond undergoes the rigorous evaluation process conducted by IGI, it receives official documentation confirming its quality attributes. The industry standard terminology for such a diamond is simply an IGI certified diamond or an IGI graded diamond.
Diamond certification through IGI involves a comprehensive examination performed by trained gemologists using specialized equipment and standardized grading procedures. The certification process evaluates the four essential characteristics commonly referred to as the Four Cs: cut, color, clarity, and carat weight. Each of these factors is carefully assessed and documented in the official grading report issued by the institute.
An IGI grading report provides detailed information about a diamond's specific attributes. The cut grade indicates how well the diamond has been shaped and faceted, which directly affects its brilliance and light performance. Color grading measures the presence of any yellow or brown tints, with the finest stones being completely colorless. Clarity evaluation identifies internal inclusions and external blemishes that might affect the stone's appearance or durability. Carat weight provides the precise measurement of the diamond's mass.
The terminology used in the diamond industry is straightforward when referring to certified stones. Rather than using special names or designations, jewelers and consumers simply specify the certifying laboratory when describing the diamond. An IGI certified diamond is distinguished from uncertified stones by the presence of the official grading document and often by a laser inscription on the diamond's girdle that corresponds to the report number.
It is important to understand that certification is not a process that changes the diamond itself. The stone remains unchanged during evaluation; certification merely documents and verifies its existing qualities. This documentation becomes valuable proof of the diamond's characteristics, particularly useful for insurance purposes, resale transactions, and consumer confidence in their purchase.
When shopping for diamonds, recognizing the significance of IGI certification helps buyers make more informed decisions. The grading report serves as an objective third-party assessment that verifies the seller's claims about the diamond's quality. Without such certification, buyers must rely entirely on the seller's descriptions, which may not always be accurate or complete.
The IGI laboratory maintains strict standards for its grading processes, employing only qualified gemologists who follow consistent methodologies. This standardization ensures that IGI certifications are reliable and consistent across different locations where the institute operates. Diamonds certified by IGI carry the institute's seal of approval, indicating that the stone has been evaluated by recognized experts using professional standards.
For those specifically seeking IGI certified diamonds, the process is straightforward. When purchasing a diamond, buyers should request to see the original grading report and verify that the stone's serial number matches the documentation. Many IGI certified diamonds also feature a microscopic laser inscription on the girdle that displays the report number, providing additional verification of authenticity.
In summary, there is no unique or specialized term used to describe diamonds certified by the International Gemological Institute. The appropriate and widely accepted terminology is simply an IGI certified diamond or an IGI graded diamond. This clear and direct language accurately conveys that the diamond in question has undergone evaluation by IGI and carries the institute's official documentation confirming its quality characteristics.
