The Australian Yellow Diamond Discovery That Changed Geology

#diamond #australia #geology Deep in the remote Kimberley region of Western Australia lies one of the most surprising discoveries in the history of diamond geology. The Ellendale diamond field, famous for producing some of the world’s most beautiful yellow diamonds, forced geologists to rethink how diamonds reach the surface and where they can be found. For decades, the global diamond exploration model focused almost entirely on kimberlite pipes, volcanic conduits known to carry diamonds from deep in the mantle. But the discovery of diamonds in lamproite at Ellendale changed that understanding forever and opened the door to a completely new way of searching for diamond deposits. This video explores the geological story behind the Ellendale diamond mine and the remarkable field of lamproite volcanoes that host these rare yellow diamonds. Located east of Derby in the West Kimberley, the Ellendale diamond field is not a single deposit but a cluster of dozens of volcanic intrusions spread across a large area of Western Australia. These unusual ultrapotassic volcanic rocks erupted during the Miocene around 22 to 19 million years ago, blasting upward from deep within the mantle and transporting diamonds toward the surface. The eruptions likely formed small explosive volcanic vents rather than large stratovolcanoes, leaving behind volcanic pipes and crater fills that today contain the diamond-bearing lamproite. Ellendale quickly became famous in the global diamond industry because of the extraordinary colour of many of its stones. The mine produced a large proportion of the world’s fancy yellow diamonds, gemstones prized for their rich golden colour and exceptional brilliance. The yellow colour in these diamonds is caused by nitrogen atoms trapped within the diamond crystal lattice during formation deep within the mantle. These nitrogen impurities absorb blue light, giving the stones their distinctive yellow appearance. At its peak, Ellendale supplied a significant portion of the world’s fancy yellow diamonds, and many of the best stones were purchased by luxury jewellery companies for high-end collections. Beyond the gemstones themselves, the Ellendale discovery had enormous implications for exploration geology. Prior to the discovery of diamondiferous lamproite in Western Australia, most diamond mines around the world were associated with kimberlite pipes. Kimberlite had long been considered the primary rock type capable of transporting diamonds from mantle depths to the Earth’s surface. The Ellendale lamproites demonstrated that another type of deep mantle magma could perform the same role. This expanded the global exploration model and encouraged geologists to investigate other ultrapotassic volcanic rocks as potential diamond hosts. Study Used To Construct This Video: The Kimberley Diamond Company Ellendale diamond collection at the Western Australian Museum: https://www.researchgate.net/profile/Peter-Downes-2/publication/258848813_The_Kimberley_Diamond_Company_Ellendale_diamond_collection_at_the_Western_Australian_Museum/links/0f31752f1f50867174000000/The-Kimberley-Diamond-Company-Ellendale-diamond-collection-at-the-Western-Australian-Museum.pdf Video we made on the Argyle Pink Diamonds: https://youtu.be/Aigj4yhK8Qw Thank you so much for watching! If you are not in a position to donate, I totally understand! The biggest supporting factor that you engage in is to watch our videos all the way to the end (very important for helping us rank) and to share them around so please consider doing this so that Youtube recommends our channel more. Check out the OzGeology website: https://ozgeology.com If you are in a position to support our channel on Youtube Membership or by joining our Patreon, the link to all of this can be found below: 🎥 If you would like to support this channel, consider joining our Patreon: https://patreon.com/OzGeology 👉 You can also click the "join" button to join our Youtube channel's membership. Every contribution helps to create more videos. YouTube Membership: https://www.youtube.com/channel/UCxLrvjGBzYmj8W1rJToPasg/join 🌋 Subscribe to our Youtube Channel: https://www.youtube.com/channel/UCxLrvjGBzYmj8W1rJToPasgsub_confirmation=1 💥Link To Our Facebook: https://facebook.com/OzGeology 🌏 About OzGeology The core mission of OzGeology is to make geology exciting, accessible, and inspiring for everyone. Instead of presenting rocks and earth science as dry or overly academic, OzGeology brings stories of the planet to life, revealing how every mountain, mineral, and landscape tells part of Earth’s grand adventure. The goal is to help people see the world differently, to understand the dynamic forces shaping Australia and beyond, and to spark curiosity in the next generation of geologists. Through engaging storytelling, field exploration, and clear explanations, OzGeology turns the study of our planet into a journey of discovery rather than a classroom lecture.