The Ellendale diamond discovery in Western Australia revealed one of the most unusual diamond deposits ever found, producing rare yellow diamonds and reshaping the geology of diamond exploration. Unlike traditional diamond mines formed in kimberlite pipes, Ellendale’s diamonds were hosted in lamproite, a rare volcanic rock derived from deep mantle melts. This discovery changed how geologists search for diamonds worldwide and led to major breakthroughs, including the discovery of the Argyle diamond mine. In this video, we explore how these yellow diamonds formed, what the Ellendale diamond field looks like, and why this Australian discovery changed geology forever.