In the discoveries of the Silk region of Kashan, jewelry made of shells or soft stones has been found, which, according to Girishman, are of a type that was found only in the Persian Gulf and were apparently traded by traveling peddlers. In the 4th millennium BC, jewelry making became more diverse, as Iranians used rare stones such as agate, turquoise, jade, lapis lazuli, and also crystal in jewelry making. Today, this field, especially in Tehran province, benefits from the existence of numerous artists, workshops, and specialized art galleries who, by utilizing creativity in design and form and even innovation in combining other traditional handicrafts and arts such as painting, calligraphy, enameling, and the like with traditional jewelry, have been able to turn this field into an entrepreneurial field with a bright export outlook.