The diamond grading industry is populated by gemological laboratories that are virtually indistinguishable. In this "alphabet soup" of grading labs, diamonds are graded by hand and eye - an ultimately subjective assessment. While this continues to be standard practice for all laboratories, GSI has enhanced this process by adding advanced technology and intelligent software. GSI is a leading gemological lab offering a variety of gemological services worldwide. From basic grading service to the most sophisticated testing and examination using advanced instruments, GSI does it all. Every diamond is unique and differs in quality, shapes, and sizes. A diamond, natural or lab grown, is assessed for its quality based on a combination of many factors.