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Season 237 - Day 5 of 14
Earth Science
Which precious gemstone, a variety of corundum typically found in deep blue, ranks as a 9 on the Mohs scale, making it second only to diamond in hardness?
Historically worn by medieval clergy to symbolize heaven and used as a given name for women, it is most famously the centerpiece of the engagement ring worn by Princess Diana and Kate Middleton.
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