Each bow tie is unique Stone type: marble Discovery site: Ireland Geological age: approximately 215 million years old Thickness: approx. 3.5 mm Weight: approx. 40 g Geological origin: Irish Green was created in Ireland. The colours are reminiscent of Ireland's green landscapes. The applied pressure compacted the lime layers over the course of many millions of years. The builders discovered the green, decorative material for their buildings as early as the Renaissance.