White Granite Boulders These boulders are harvested and shipped from regionally located quarries. Material is shipped bulk, palleted and specimens on lowbeds throughout California and other states. White Granite Boulders are have a very lightly patterned salt and pepper finish than darker colored granite boulders. These boulders and cobbles are available as basted irregular granite or river washed smooth surface granite boulders. The boulders come in various shapes and sizes ranging from 18" in diameter to 60" and larger. The White Granite Boulders material is a blends in well with other granite boulders and cobblestones.