Fewer visitors at its new destination - than Edinburgh - and in a lock-tight building? Hoping the embarrassment will go away?
BBC "Geological testing revealed the stone was quarried at Scone, just outside Perth."
The real "Palestine Porphyry" Coronation-Stone/ Stone-of-Destiny was Patriarch Jacob's Pillar that he slept on at Luz, which is still hidden in Scotland somewhere (See it also mentioned in this exposé **ScotlandMessenger.pdf** (7.1 MB)).
It's the real British Throne (see movie below).
More: Christmas Day - The Final Overturn of The Stone/ Throne of British Monarchy