From the priceless Tiffany & Co. jewel to the How to Lose a Guy in 10 Days necklace, these jaw-dropping gems are unforgettable Kaitlyn is a former Assistant Style & Beauty Editor at PEOPLE.

The extremely rare, 10-carat Mediterranean Blue diamond could fetch a whopping $20 million at Sotheby's High Jewelry auction ...

Mineral curator Mike Rumsey discusses the science behind the Aurora Pyramid of Hope, an unrivalled collection of 296 coloured diamonds. On display in a lofty Museum gallery is a small, glittering ...