Besides their economics, geoscientists can study geology in deep mantle through diamondiferous kimberlites or diamondiferous Lamproites, and there have been many advances in this area worldwide. Surface element cycling and geological events in the mantle were discovered through inclusions and fluids contained in diamonds. The C—P—T—PH2O conditions for determining the origin of mantle magma were determined through DKL mantle xenoliths and xenolith crystals. The scientific research value and economic value of DKL have also driven the discovery of multiple DKL fields in Angola, Russia, India, central Canada, and other regions, thereby promoting deep geological research. This article provides a brief overview of global research achievements in this area.