Diamond and Gemstone reports (certification), analysis, appraisals and identification of treatments and synthetics. Specializing in Tanzanite and colored gemstones. Get your gemstones verified by GISA for peace-of-mind. Do not be fooled into buying fakes or cheap treated gemstones. The Gemmology Institute of Southern Africa is well equipped to analyze and grade your gemstones to make sure you have the quality gems that you want so that they can be passed down for generations as a valued heirloom. GISA`s gemmologists strive to stay up to date with current technologies by continually updating their training to ensure that they are able to spot and identify a myriad of treatments and synthetic gemstones that may be passed off as the real thing.