Among many gem labs, GSI https://gemscience.net/ is one of the leading gemological labs. They are working in this industry for many years and they experience and reputation in this industry. This works for them very well. They enhanced the process of grading diamonds by using technological advances. They offer a variety of grading services. It also uses industry connections to promote communication and education programs for both the trade and consumers. I appreciate their transparency, professional approach to work, trust them for my orders and would like to recommend them.