International Granite & Marble Corp. – Who We Are. IGM has been in business in the United States since 1948, importing and distributing granite, marble, limestone, onyx, and other natural stones in the form of slabs and tiles to fabricators and contractors across the Eastern seaboard and the Midwest. This short video displays some of the IGM people and projects they have been involved in over the past several years. Principal photography and video by Chris Schultz. Music by Justin Dodge, “Before the Silence”, Tripple Scoop Music.