The natural stone institute's mission statement is: to lead, support, and promote a unified natural stone industry through authoritive information, education, standards, and advocacy. Additionally, its CORE values include leadership, stewardship, collaboration, and professionalism.the natural stone institute (NSI) was formed in 2018 as a merger of the marble institute of america (MIA) and the building stone institute (BSI). The building stone institute was formed in 1894 as the international CUT stone contractors and quarrymen's association; the name was changed to the building stone institute in 1955. Established in 1903 as the national association of marble dealers, the marble institute of america officially formed in 1944, when the association merged with the national association of marble producers. In 1962, the national association of marble builders merged with marble institute of america.