According to reports, the tiara isn't the mystery that we once thought it was, though, as it's thought to have been the Greville Emerald Kokoshnik tiara, which Princess Eugenie borrowed from her ...

Prince Harry is alleged to have got frustrated in the row over the tiara (Image: Getty Images) "There was scandal attached. "For this reason, the emerald tiara was seldom, if ever, put on public ...