GSI Info: Diamond certificates - Reports & Services - Gemological Science InternationalGemological Science International (GSI) is an independent commercial gemological laboratory. We combine state-of-the-art technology with deep professional expertise.
➥ GSI provides reliable, fast, and professional gemstone identification as well as grading and appraisal services to the global fine jewelry industry. GSI is the only major gemological laboratory established in the 21st century. Within a relatively short period of time, GSI has grown to become one of the largest gem labs in the world.
For more information visit: www.gemscience.net