The Oppenheimer Blue, a 14.62-carat diamond, fetched $57.5 million in 2016, making it a benchmark in the gemstone market. Not to be confused with common jade, jadeite is the most prized form of ...

The pale blue stone has passed through the hands of royals, art collectors, sultans and aristocracy – but who does it belong to now?

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The Idol’s Eye, a precious 17th Century gemstone, became the center of a dispute between art collector Sheikh Hamad bin Abdullah Al Thani, a cousin of Qatar’s ruler Sheikh Tamim bin Hamad Al Thani, ...