Jura Grey Blue Limestone is a tremendously hard wearing stone (rated 4 from 5 – suitable for commercial use). From the Jura mountains of Germany, Jura Grey Blue Limestone is from the upper Jurassic period hence its stunning fossilisation (large ammonites, jelly fish and sea horses). The honed finish is matt with straight edges and one of our best selling stones due to the combination of exciting fossils and wear ability and cost.