Razavi Khorasan province is one of the provinces of Khorasan in northeast of Iran with the centrality of Mashhad city. It’s the 4th biggest province in the country. Razavi Khorasan province, due to geological diversity, is the place of origin for many of precious minerals and due to its vastness has very diverse natural conditions and each of its different areas have special attributes. Historians believe the birthplace of Gemology in the world has been the Tus region.
The existence of Turquoise mine in this region as the oldest and highest quality mine in the world with more than five thousand years of history, shows that the attention and care given to precious stones in this region have roots in pre-historic times. Khorasan has always been the center of attention throughout history because of being located on the route of the Silk Road. This province enjoys a great deal of fame and significance due to having the Holy Shrine of Imam Reza in Mashhad, which has a substantial influence in boosting the tourism and economy of this province.