Carved with at least seven cup and ring marks, those shallow circular depressions surrounded by concentric rings that are characteristic of prehistoric rock art across Atlantic Europe, it now sits as a kind of accidental ornament to a Victorian Gothic Revival house, far removed from wherever it originally stood and whatever purpose its carving once served.

The stone came to light around 1870, when workers were excavating an artificial lake on the Humewood estate. Rather than be discarded or lost entirely, it was moved and placed before the castle, where it has remained. Liam Price, writing in 1934, recorded the cup and ring marks in detail, giving the stone its first documented description. The original findspot is catalogued separately, a reminder that the stone now occupies a secondary location, displaced by the landscaping ambitions of the Victorian era from its prehistoric context.