Part of the British Crown Jewels, this piece is only used for the moment of coronation of a monarch.
It lies deep in the Tower of London under many a lock and key.
It is made of the highest quality fabric, crafted with solid gold, and set with semi-precious stones (all inorganic materials).
According to Her Majesty Queen Elizabeth II, it's quite heavy, 2.23 kg.
Although the crown jewels are highly guarded and secure, they are extremely valuable. The monetary status of this object makes it susceptible to immense damage or loss if it gets in the hands of those who would disregard its cultural and historical value for financial gain.
https://www.hrp.org.uk/tower-of-london/history-and-stories/the-crown-jewels/#gs.19k3ax