Christian Crosses appear on Class 2 Pictish Symbol Stones in several styles – general examples are shown below:
Typically the style using a “ringed” Cross is referred to as Celtic and an “unringed” Cross as Roman or Latin. Commonality within these carving styles across many Class 2 Stones suggests a single or integrated influence – almost from content and design guides. Perhaps these variants reflect different time periods and a dating possibility particularly if there is a straightforward sequence between pre-Christian, Celtic Christian and Roman Christian times.
Detail of the design and construction with an exploration into discovering whether there might be a dating sequence are here in Styles of Crosses – a dating sequence indicator?