Why might 'St Cuthbert's cross' have been hidden during the Reformation?

So I am trying to work out if the gold and garnet Anglo-Saxon cross found in the principal grave of Durham Cathedral in 1827 could possibly be the Black Rood of Scotland - part of the Scottish crown jewels that went missing in the Cathedral during the Reformation. The grave the cross was found in was that of the Cathedral's patron saint Cuthbert, so it …