If a price tag of $50 million is being bandied about, it is because finding Paraiba tourmalines of such a size (and matching) is not an every day occurrence.
This GIA article on tourmalines might help to explain the cost of Paraiba tourmalines.
https://www.gia.edu/tourmaline-quality-factor
And also this item
https://www.gemsociety.org/article/paraiba-tourmaline/
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