Someone explain
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One of the "woo" theories is that they had a way of "liquifying" rock and casting it - hence the similarity in detail to modern metal-cast sculptures.
The working theory is they just had copper tools to cut and shape the stone. But copper isn't exactly a hard metal. My theory is they must have had diamond cutting bits. After all diamond, like gold exists in it's natural form, it doesn't need to be smelted or combined with other chemicals to extract it.
because it wasn't necessary.