J Runö is a warm, grey porcelain stoneware with a limestone appearance in a matt surface. Runö is very true to nature with fossil-like details and beautifully varying tone differences between the tiles. Inspired by the stone that is mined along the limestone belt that stretches from Öland, under the Baltic Sea and the old Swedish countryside on the islands off the coast of Estonia, and further through Tallinn up to St. Petersburg.  The limestone has been mined along this line for generations and has been used in buildings throughout Scandinavia.

The variant that J Runö got his inspiration from is mined in Estonia. The original stone is marketed under several different names such as Baltic Grey, Reval Kalksten and Lindholmen. The island of Runö, after which the series is named, is located along the limestone route and was inhabited by Estonian Swedes until World War II, when the islanders fled to Sweden and away from the Soviet Union's advance.