"I think  colored diamond course is the best course I've had at AIGS,including the basic gemology course,ruby & sapphire identification, ruby & sapphire treatments, 1-day diamond, 1 week diamond, jade and pearls.The selection of stones was terrific.The instructor of this course is the best gem instructor I've had to date. What did i like most in the course is the application to the industry because I consider entering this field".

                                                                                                                                    John Gilman, USA