Four years after being acquired by French luxury group LVMH, Tiffany & Co. is rebooting its watch collections by leaning into its heritage as a diamond jeweler.

“My first fine jewelry job was at Tiffany’s on the sales floor ... Mohammed has expanded his repertoire with precious gemstones and custom novelties commissioned by his clients.

Due to the increasing pollution in the world’s oceans, natural pearls are becoming extremely elusive—even still, according to Sotheby’s, the majority of natural saltwater pearls were ...