Today .a returning client came up with a most unusual request: combine one of the kerbstones from the Knowth, Ireland, neolithic passage tomb with a torc topped with finials of her favorite animals, a cat and a raven. I was pleased to oblige!
"Knowth is a Neolithic passage grave and an ancient monument of Brú na Bóinne in Ireland's valley of the River Boyne. It is the largest passage grave of the Brú na Bóinne complex and consists of a large mound (known as Site 1) and 17 smaller satellite tombs. The mound is about 40 ft high and 220 ft in diameter, covering roughly a hectare. It contains two passages placed along an east-west line and is encircled by 127 kerbstones, of which three are missing, and four badly damaged. The large mound has been estimated to date from between 2500 and 2000 BC. - Wikipedia
You can learn more about This particular stone, Kerbstone 15, here: http://www.knowth.com/knowth-kerbstone15.htm