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The EPA installed raised barriers and layers of thick plastic to prevent groundwater runoff and used air-quality monitors to ensure that the battery dust, which contains precious and semiprecious metals, did not contaminate the air.

Four months after the British Museum fired a curator suspected of stealing gems, jewelry and semiprecious stones, the London institution on Tuesday released further information about the fate of the missing items.

Addressing a British parliamentary committee on Wednesday, Mark Jones, the museum’s interim director, said that inventory failures contributed to the theft of about 2,000 artifacts, including gems, semiprecious stones and glass items.

Other discoveries included semiprecious stones such as amber from the Baltics and lapis lazuli and carnelian from Mesopotamia and the northern Levant, according to Fischer.

It’s not as valuable as other crowns, for it’s set with mostly semiprecious stones.