In John XXIII's case, though he did receive his own tiara, his election was so unexpected that Bergamo, his native region, which donated the tiara, had not plans in train to manufacture a tiara quickly in the event of his election.
Though lacking in jewels, Pope Paul's tiara weighs 10 lb (4.5 kg) in contrast to the 2 lb (0.9 kg) weight of the previously-used Palatine Tiara.
It was manufactured for the pope because Pius complained that the normal tiaras worn, the Palatine Tiara, the Golden Tiara and his particular favourite, the Tiara of Pope Gregory XVI were all too heavy and uncomfortable to wear.
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