【Tech 24H】An international team of scientists, including researchers from the Hebrew University, the University of Nevada, and the University of Cambridge, has discovered a naturally occurring nickel-rich alloy in diamonds from South Africa’s Voorspoed mine. For decades, both theoretical and experimental studies suggested that nickel-rich alloys should stably exist at depths of 250-300 km in the Earth’s mantle, but natural samples directly confirming this prediction are rare. These diamonds, formed at depths of 280-470 km below the surface, provide direct validation for the long-speculated redox model of the mantle.