Hornblende Gneiss Whiskey Stone - Set of 4These are the most sustainable whiskey stone set available on the market now. The set contain 4 stones with walnut display with 940 million year old stones from the region of St lie de Caxton, Qc, Canada. This stone comes from the time of earth when the American continent was formed. This stone is characteristic of an happy mixture of dark emerald green and black, there are insertions of pearly white calcite crystals. The extraction and manufacturing