A method and a kit is described for cooling beverages. Each employs a naturally occurring, non-porous igneous rock material, such as granite, that may be configured in the form of a polyhedron, such as a cube. The method involves placing one or more masses of the material in a reduced temperature environment for a selected time that may be sufficient to allow the mass to reach equilibrium temperature with the reduced temperature environment. One or more masses are then placed in a vessel along with the beverage to be cooled. The kit houses the masses in a lidded container and one or more vessels are included. A correlation between the size of the masses and the vessels is disclosed.