With an experienced, professional staff and using cutting-edge technology for grading, GSI https://gemscience.net/contact/ gemological lab offers a wide range of services for identification, analysis, and grading of colored gemstones and diamonds. They not only focus on just grading of stones but on gemstone reporting, gemological research, consumer protection, and educational initiatives as well. Without compromising the quality, providing excellent services is their priority. I'm working with them for years now and personally prefer and trust GSI for my orders.