A certificate is known as either a diamond grading report or a diamond dossier by wholesalers, retailers and consumers. On the certificate, the diamond’s exact measurements, weight, cut and overall quality are written. A certificate is a very useful tool for identifying a stone for it points out the diamond’s individual characteristics. Keep in mind, when you are shopping for a loose diamond, that a grading report will help you make an informed decision the stone that is right for you.
The top-rated and foremost authority on diamonds and colored stones in the world is called GIA. 3-6 separate gemologists individually grade each and every diamond for an accurate final grade and GIA receives the grading. Throughout the diamond world, GIA grading reports are considered to be a hallmark of integrity. Two separate types of reports are issued by GIA. The full issued GIA reports is one of the most common reports. It contains the full description of the diamond and a plotting of the grade, setting and also clarity characteristics of that stone. This report is generally used for diamonds one carat and above. For diamonds under one carat the second type of report is used. The full details of each diamond graded can be found in the GIA Dossier. However, in the Dossier, a laser inscription registry number has replaced the plotting which is normally seen on a report. The registry number had been inscribed on the diamond’s gridle so that the stone can be verified without mapping of inclusion. This practice as saved the time and money it would have taken GIA to issue full reports on smaller diamonds.
The largest and oldest independent laboratory in the world for grading and assessing diamonds and fine jewelry is called The International Gemological Institute (IGI). IGI is located in prime markets throughout the world, in cities such as New York City, Los Angeles, Toronto, Antwerp, Hong Kong, Mumbai, New Delhi, Surat, Dubai, Bangkok, Tokyo and Tel Aviv. Over one million reports each year are issued by the IGI Lab which provides services to the professional jewelry community but to consumers as well. Independent diamond authentication and grading reports, colored gemstone reports, appraisal reports, and courses on diamonds and gemstones are services that the IGI School of Gemology offer.
The Diamond Lab of HRD Antwerp is the largest diamond lab in the world that meets the rules for grading polished diamonds by the International Diamond Council. These rules have been approved by the World Federation of Diamond Bourses and the International Diamond Manufacturers Association, the industry’s leading representatives associations.
In 1996 HRD Antwerp became the first diamond grading facility worldwide to be officially accredited according to the stringent international standards of NBN EN ISO/IEC 17025.
The reasons why buy a certidied diamond is that it comes with a diamond grading report quaranteed by an accredited gemological laboratory, which is independent from the saler. This report quarantees the customer that the diamond is recognised and has all the characteristics and quality specified on the certificate. That way the customer is reassured that he's buying what he paid for. TRUST MATTERS!!