these are nordic rocks, mined from ancient swedish pollution-free base rock. as they claim it to be the purest way of cooling your drink. ( purest? really? ) anyway, just throw some of these stone cubes into the freezer for an hour before putting them in your glass.
voilà! you’d get yourself a drink ‘on the rock’ well, literally. and the stones do not melt so your drink will be not be contaminated. you can re-use them many times as you like. yes, eco-friendly.
nordic rock seems to be a good choice for an unusal gift. 10 stone cubes with leather pouch cost £15.99. that’s almost 1,000 baht. i wonder if the rock around here can give the same cooling effect as these ancient rock?