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Re:De Beers admits defeat over man-made diamonds by thaumasiotes on Wednesday May 30, 2018 @03:11PM (#17190720)
Sadly, I do not personally own any historically significant jewelry. But you can read about it pretty easily.

https://en.wikipedia.org/wiki/Black_Prince%27s_Ruby

> The Black Prince's Ruby is a large, irregular cabochon red spinel weighing 170 carats (34 g)

> It wasn't until 1783 that spinels were differentiated from rubies.

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