Menahem Sevdermish is considered one of the world-leading experts in gemology and precious stones in particular. He holds an FGA diploma with honors by the Gemmological Association of Great Britain.
In 1975, together with Mr. Meirom, he founded the first gemological institute in Israel, known as GIPS, which operates to this day under its new name – GWLAB. Among Mr. Sevdermish's many innovations, the Carmel cut, developed in 1976, is one of the most prominent, which is considered as the flagship of the Israeli gem industry, and some even say that it served as the basis for the Radiant diamond cut development.
In 1977, Sevdermish published a set of two books called "The Dealer`s Book of Gems and Diamonds", comprising of over a thousand pages, which is considered as one of the best books in the field. In addition, Sevdermish published many articles in world-renowned magazines such as Gems & Gemology and Journal of Gemology.
Since the late 1990s, Sevdermish became engaged in the development of Gemewizard, the revolutionary digital gem-color description technology and its applications. In 2005, the Gemewizard method was adopted by the Gemological Institute of America (GIA) and until now, is being used by all their laboratories and graduates as well as by major leading institutes around the world.