Lord Twining says:
Until the beginning of the eighteenth century the personal crowns of the French kings were plain and unembellished with precious stones. In1722 Louis XV (1715-74) introduced a new feature by having a magnificent crown set with the richest stones from the Crown Collection made for his personal use. [I have never felt that Twining was strong on syntax.]
The footnote says: It was usual for the French kings to present their personal crowns to the Abbey of St Denis after the coronation. This may account for their lack of jewels. That of Louis XV was stripped of its jewels and reset with paste before presentation.
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