Gemological Science International (GSI)

Gemological Science International (GSI) is one of the three largest US gemological laboratories with 8 offices in the United States, India, Israel and Belgium. GSI is the most technologically advanced gemological laboratory that provides professional gemstone identification, grading and appraisal services to some of largest and most recognized fine jewelry retailers and manufacturers worldwide. We provide certification for some of the world's most prominent diamond brands, such Leo Diamond, Tolkowsky Diamond, Sitara, Solitaria and many others. GSI has re-engineered the processing paths for gem identification and grading, which has resulted in higher levels of productivity and reduced costs. This cost efficiency is passed on to our customers and ultimately to consumers, making these beneficial grading reports more affordable.