Erinstone®, a guarantee for quality and authenticity Erinstone® is a registered trade name under which authentic Irish Blue L ... imestone, quarried at Holdensrath Quarry in Kilkenny and James Walsh Quarry in Carlow is sold. The quarried stone is selected to match the highest aesthetical standards (colour variation, fossil content, white veins,…) and mechanical properties (compressive strength, porosity, wear resistance,..). Erinstone® is therefore a guarantee for a consistent supply of quality Irish Blue Limestone. read more