Tag

gemstones

26 posts

• 09 July 2026The 1.2-Billion-Year-Old Volcano That Turned Diamonds PinkIn Western Australia's East Kimberley, a 1.2-billion-year-old lamproite volcano brought diamonds from the mantle and, through a rare process of crystal deformation, produced 90% of the world's pink di
• 07 July 2026The 100-Million-Year-Old Sea That Turned Bones to OpalHow 100-million-year-old marine reptile and dinosaur bones in the Cretaceous sediments of Lightning Ridge were transformed into precious opal, preserving ancient life in gemstone.
• 27 June 2026The 2.7-Billion-Year-Old Sea That Made the SapphiresHow 2.7-billion-year-old basaltic lavas in central Queensland weathered into the alluvial gemfields that produce Australia's richest sapphire deposits.
• 26 June 2026The 1.7-Billion-Year-Old Mound That Makes OpalHow 1.7-billion-year-old stromatolite mounds in central Australia's Great Artesian Basin became the silica-rich ghost that produces the continent's precious opal.
• 25 June 2026The 40,000-Year-Old Volcano That Gave Us a MirrorHow a 40,000-year-old volcanic eruption in South Australia's Mount Gambier region created a maar crater lake that preserves the only known deposit of volcanic glass used by First Nations peoples for m
• 25 June 2026The 100-Million-Year-Old Volcano That Filled a Lake with SapphireHow a 100-million-year-old volcanic eruption in eastern Queensland created the Anakie sapphire fields—not in molten rock but in a quiet lake where gems crystallised from cooling ash.
• 25 June 2026The 3.5-Billion-Year-Old Sea That Built the World's Oldest SapphiresHow 3.5-billion-year-old metamorphism in Western Australia's Yilgarn Craton created some of Earth's oldest sapphires—long before the gem was thought possible.
• 25 June 2026The 17-Million-Year-Old Lake That Boiled Australia's Only Zeolite GemHow 17-million-year-old volcanic lakes in northern New South Wales created Australia's only known deposit of the zeolite mineral erionite, forming pale green gemstones from altered volcanic ash.
• 25 June 2026The 250-Million-Year-Old Sapphire That Grew in Clay: Queensland's RubyvaleHow 250-million-year-old volcanic activity in central Queensland created sapphires not in molten rock but in ancient clay beds, producing the distinct blue-green gems of the Rubyvale fields.
• 25 June 2026The 500-Million-Year-Old Volcano That Holds Australia's Rarest Blue SapphiresHow 500-million-year-old volcanic activity in New South Wales' New England region created sapphire crystals that still wash from deep weathering profiles today.
• 20 June 2026The 500-Million-Year-Old Seafloor That Became Australia's Largest Sapphire DepositsHow 500-million-year-old metamorphism in central New South Wales transformed a deep-seafloor into the continent's richest sapphire deposits, where rubies and sapphires still wash from ancient gravels.
• 20 June 2026The Beach That Became a 120,000-Year-Old Sapphire CoastHow 120,000-year-old beach sands in northern New South Wales were cemented into sapphire-bearing gem gravels, creating a shoreline where erosion concentrates the hardest minerals on Earth.
• 20 June 2026The River That Became a 250-Million-Year-Old Jade: South Australia's Cowell NephriteHow 250-million-year-old metamorphism in South Australia's Eyre Peninsula transformed a magnesium-rich seafloor into one of the world's finest nephrite jade deposits—a stone carved by First Nations pe
• 20 June 2026The Volcano That Grew a Mountain of Sapphire: Queensland's Mount Leyshon: How a 270-million-year-old volcanic pipe in central Queensland was so thoroughly altered by hot, acidic fluids that it transformed into one of the world's largest sapphire deposits—a gemstone born n
• 20 June 2026The Ash That Turned a Seafloor to Sapphire 50 Million Years Before the Alps RoseHow 450-million-year-old volcanic ash in central New South Wales was metamorphosed into one of the world's only known sapphire-in-anthracite deposits, recording a lost volcanic arc along the margin of
• 19 June 2026The Sapphire That Rained from a 225-Million-Year-Old Volcano: Queensland's Anakie GemfieldsHow 225-million-year-old basalt eruptions in central Queensland carried sapphires to the surface from deep within the continent, creating the Anakie gemfields.
• 19 June 2026The Sapphire That Grew from a Drowned MountainHow a 300-million-year-old granite mountain in central Queensland was buried by lava, then weathered into sapphire, ruby, and zircon deposits that still yield gemstones today.
• 18 June 2026The Reef That Became a Mountain of Sapphire: New South Wales' Cudgegong Gemfields: How 400-million-year-old volcanic heat transformed a Devonian limestone reef in central New South Wales into sapphire, diamond, and zircon deposits that still yield gemstones today.
• 18 June 2026The Heat That Turned a Coral Reef into Gemstone: Queensland's Sapphire FieldsHow 300-million-year-old volcanic heat transformed a tropical reef in central Queensland into sapphire, ruby, and zircon deposits that still yield gemstones today.
• 18 June 2026The Lava That Left a Diamond in the Sand: Western Australia's Argyle Lamproite PipeHow a 1.2-billion-year-old lamproite pipe in Western Australia's East Kimberley produced Earth's richest source of rare pink diamonds, recording a continent's journey over a deep mantle hotspot.
• 24 May 2026The Magma That Built a Mountain of Jade: Western Australia's Enderby Island NephriteHow 1.2-billion-year-old metamorphism in Western Australia's Enderby Island created one of the world's largest deposits of nephrite jade, recording a collision between two ancient continents.
• 24 May 2026The Magma That Crystallised a 170-Million-Year-Old Forest: Queensland's Agate CreekHow 170-million-year-old volcanic rhyolite in north Queensland's Agate Creek precipitated agate, jasper, and chalcedony in ancient gas cavities, preserving a Jurassic forest in silica.
• 23 May 2026The Lava That Crystallised a Trillion Carats: Queensland's Sapphire GemfieldsHow 30-million-year-old basalt eruptions in central Queensland brought sapphires to the surface, creating one of Earth's richest gemstone deposits.
• 23 May 2026The Ash That Rang a Bell of Glass: Queensland's Mount Hay ThundereggsHow 120-million-year-old rhyolitic volcanism in central Queensland created thundereggs—agate-filled geodes that preserve the gas cavities of an ancient volcanic landscape.
• 17 May 2026The Lava That Turned to Sapphire: Queensland's Anakie GemfieldsHow 300-million-year-old volcanic eruptions and tropical weathering created Australia's richest sapphire deposits in central Queensland's Anakie region.
• 11 May 2026The Opal That Grew in a Cave: Lightning Ridge's Black OpalIn the claystone of Lightning Ridge, New South Wales, 100-million-year-old opal formed in underground cavities where silica-rich water filled the spaces left by rotting wood and dinosaur bones.