Detail on the Nigg cross-slab which dates from the 8th Century AD
Conservation work has started on an intricately carved Pictish stone from Easter Ross.
The Nigg cross-slab dates from the 8th Century AD and features snakes and a depiction of monks receiving bread from a raven sent by God.
Nigg Old Trust received grants towards the £180,000 restoration project.
The monument has been taken to a workshop in Edinburgh and will eventually be put back on display at 16th Century Nigg Old Church.
The cross-slab is one of Scotland's greatest art treasures, according to the trust.
The stone's entry in the Highland Historic Environment database described it as being intricately carved.