Check the listing for details. Raw Shungite stones for water purification Authentic black shungite Tolvu. Color: Black, Condition: New. Listed at 18.90 USD. Authentic shungite stones from Karelia.Add two or more pendants from our store to your cart and get a significant discount on shipping.More than 100 different products from genuine shungite in our store: shungite-tolvu-stoneRaw Shungite black stones for water are 0.8 to 2 inches in size . The total weight of the stones is about 2.8 OZ / 80 grams. This is a raw unprocessed genuine shungite stone directly from a mining deposit. Please rinse your shungite stones under running water to wash away the remnants of shungite dust. This can make the water black if you do not wash the shungite stones before the first use. It is recommended to change the black stones of shungite once every three months, due to the fact that shungite accumulates and absorbs harmful impurities from the water. Currently, a large range of our products is stored in our transit warehouse in the USA. This gives us the opportunity to deliver our goods from genuine shungite stone in just one or three days to our customers.