The International Gemological Institute is another worldwide diamond certification authority. It tries to work off the same strict standards as GIA but unfortunately fails often.
If comparing prices of a GIA certified diamond with an IGI certified diamond of exactly the same grades you should discount the IGI diamond by 40% depending on which country office of IGI the certificate is issued from. The following is based on our opinion and experience:
Belgium - discount 20%;
Dubai - discount 40%;
New York and LA- discount 15%
Diamond.ie opinion : Don't buy one from Dubai. The others are ok.
View an IGI certificate.