Diamond Certification / Diamond grading report is a report that certifies the diamond as genuine and describes it with the information about the color grade, flaw grade, weight, cutting and proportioning etc. Most diamonds above 0.3 CTS are usually evaluated by lab entities. Some of the most reputable Diamond Laboratories are GIA, IGI, and HRD. As certificates play a main role in determining the value of diamonds, it is important to know more about the different grading systems.
The GIA (Gemological Institute of America) is the most well-respected and renowned diamond grading entity. GIA evaluates diamonds on a range of characteristics:
- Measurements (in millimeters)
- Cutting style and diamond shape
- Carat weight
- Table %
- Depth %
- Culet size
- Proportion diagram
- Polish grade
- Girdle thickness
- Cut grade (Excellent, Very Good, Good, Poor)
- Color grade (ranging from D to J)
- Clarity grade (IF, VVS1, VVS2, VS1, VS2, SI1, SI2)
- Diamond plot displaying all blemishes and inclusions
- Fluorescence grade
- Laser inscription (if applicable)
- Security features
- General comments
GIA has a popularity for ranking rated Color and Clarity, the most subjective scales, more rigorously.
The GIA laboratory grants diamonds enclosed in a paper parcel: a micro laser inscription is placed on the girdle of the diamond with its certificate variety and the emblem of the GIA laboratory.
The International Gemological Institute (IGI) Diamond Reports are issued for diamonds of any size; a plotted diagram of the traits and an image representation of proportions show up on the documents.
IGI Diamond Reports have one of a kind formats and presentations, personalized to serve a wide range of client demand in our one of a kind worldwide markets. Regardless of format, each and every IGI Diamond Report is issued in accordance to the strict global requirements and safety features for which IGI is known. The report displays stone's characteristics, carat weight, color, clarity, polish and symmetry, and proportions. A diamond diagram with plotted clarity characteristics is included.
The Diamond High Council - Hoge Raad Voor Diamente (HRD) Certificates Laboratory is one of the largest diamond certification labs in the world and keeps an exquisite reputation for fantastic and objectivity.
Each diamond is examined independently by using several experts with very sophisticated machinery, such as spectrophotometer’s, Dia-Mention systems, and cathode luminescence apparatus to ensure an excessive stage of reliability. A certificate displays the shape, measurements, carat weight, clarity, and fluorescence, color and finish grades of a diamond and a plotted diagram. The HRD and IGI laboratories provide the opportunity of delivering “sealed diamond” certificates (diamonds sealed in polyester box). Laser inscription of the cert number is an option.