{"id":584,"date":"2025-07-29T10:46:44","date_gmt":"2025-07-29T10:46:44","guid":{"rendered":"https:\/\/adiamondisforever.com\/en-hk\/?p=584"},"modified":"2026-05-21T19:04:53","modified_gmt":"2026-05-21T19:04:53","slug":"how-natural-diamonds-are-formed-over-billions-of-years","status":"publish","type":"post","link":"https:\/\/adiamondisforever.com\/en-hk\/about-natural-diamonds\/how-natural-diamonds-are-formed-over-billions-of-years\/","title":{"rendered":"How natural diamonds are formed underground over billions of years\u00a0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Natural diamonds are nothing short of legendary. Just ask Colman Domingo, Hailey Bieber and Heidi Klum, who \u2013 among many others \u2013 lit up the 2025 Met Gala adorned in diamonds that <em>literally<\/em> took billions of years to form.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These dazzling gemstones weren\u2019t made in a factory or dreamt up for the runway; they were forged deep in the Earth\u2019s mantle under crushing pressure and searing heat long before humans even existed.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Taking center stage in engagement rings and royal crowns, <a href=\"https:\/\/adiamondisforever.com\/en-hk\/education\/will-natural-diamonds-always-be-valuable-absolutely\/\">natural diamonds have symbolized status<\/a>, love and strength for centuries (King Charles III of the United Kingdom\u2019s Imperial State Crown features a cool 2,868 diamonds, FYI).&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But as entirely organic gemstones, just how do natural diamonds form? Where do they come from and how did humans discover them? We have all the answers&#8230;&nbsp;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">What is a natural diamond?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">You know what they look like when set in beautiful pieces of jewelry, but how did they come about? Natural diamonds are made of one thing: pure carbon. But not just any carbon; we\u2019re talking ancient stardust that crystalized deep beneath the Earth\u2019s surface under intense heat and pressure. Some natural diamonds are thought to be up to 3.5 billion years old, formed around the same time as life first began on Earth (no biggie, then!).&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It&#8217;s believed diamonds were first discovered in India around the 4th century BC<sup data-fn=\"109782d6-1c2d-4826-b091-2b6377890020\" class=\"fn\"><a id=\"109782d6-1c2d-4826-b091-2b6377890020-link\" href=\"#109782d6-1c2d-4826-b091-2b6377890020\">1<\/a><\/sup>,&nbsp;<sup> <\/sup>when the first mention of one was found in a Sanskrit manuscript by a minister in a northern Indian dynasty dating 320-296 BC<sup data-fn=\"a1c63df9-6cde-4796-9c99-f1227d8a1b05\" class=\"fn\"><a id=\"a1c63df9-6cde-4796-9c99-f1227d8a1b05-link\" href=\"#a1c63df9-6cde-4796-9c99-f1227d8a1b05\">2<\/a><\/sup>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diamonds are as strong as they are old. The word \u2018diamond\u2019 comes from the Greek<em> \u2018adamas<\/em>,\u2019 meaning unconquerable or indestructible<sup data-fn=\"e88e5f16-f3a4-461d-9564-6e58d2f90c42\" class=\"fn\"><a id=\"e88e5f16-f3a4-461d-9564-6e58d2f90c42-link\" href=\"#e88e5f16-f3a4-461d-9564-6e58d2f90c42\">3<\/a><\/sup>. It\u2019s no exaggeration: Natural diamonds are the hardest naturally occurring material on the planet<sup data-fn=\"659aa6bd-edb6-4be8-8626-6854685e376f\" class=\"fn\"><a id=\"659aa6bd-edb6-4be8-8626-6854685e376f-link\" href=\"#659aa6bd-edb6-4be8-8626-6854685e376f\">4<\/a><\/sup>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">And beyond their beauty and strength, natural diamonds offer rare insight into what happened deep below the Earth\u2019s surface millennia ago, making them not just stunning, but scientifically and historically fascinating.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"533\" height=\"714\" data-id=\"618\" src=\"https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_RightPortrait.jpg\" alt=\"Raw natural diamond set in magma\" class=\"wp-image-618\" srcset=\"https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_RightPortrait.jpg 533w, https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_RightPortrait-224x300.jpg 224w\" sizes=\"(max-width: 533px) 100vw, 533px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"533\" height=\"714\" data-id=\"617\" src=\"https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_LeftPortrait.jpg\" alt=\"Two diamond rings sat in a scallop shell\" class=\"wp-image-617\" srcset=\"https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_LeftPortrait.jpg 533w, https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_LeftPortrait-224x300.jpg 224w\" sizes=\"(max-width: 533px) 100vw, 533px\" \/><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What conditions create a natural diamond?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">To understand how diamonds are formed, we need to head deep underground \u2013 way deeper than your average recovery site.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A science lesson for you: Earth is made up of three layers (the crust, the mantle and the core). Natural diamonds form in the mantle, typically about 140 to 200 kilometers beneath the surface. Some rare diamonds may even originate from depths of 700 to 800 kilometers.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Down there, conditions are extreme: temperatures soar to over 2,200\u00b0F and pressure can reach up to 6 gigapascal \u2013 the equivalent of balancing an upside-down Eiffel Tower on a sugar cube, if you can imagine it!&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s not just heat and pressure that make a diamond, though. The chemical makeup of its environment, including trace elements and minerals, plays a big role in determining a diamond\u2019s final size, color and clarity. That\u2019s why no two natural diamonds are exactly alike \u2013 and why gemologists are so obsessed with studying them.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Each gemstone reveals a tiny, glittering clue about the epic geological events happening beneath our feet.&nbsp;&nbsp;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">How diamonds reach the Earth\u2019s surface<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">We\u2019ve got ancient volcanoes to thank for the final step in the diamond formation process. After all that time spent forming deep in the Earth\u2019s mantle, diamonds rose to the surface in one of the most dramatic geological events on record.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Here\u2019s how it worked: extreme heat and pressure deep underground contributed to how natural diamonds formed but it was the rare volcanic eruptions that brought them up. Magma (molten rock) surged from about 160 kilometers below ground, carrying diamonds along with it. As it cooled, it formed vertical, carrot-shaped pipes called kimberlites.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sadly, not all diamonds made it. Many remain trapped far beneath the surface, meaning the diamonds humans have been able to recover are part of a very limited and exclusive group. The last eruption of this kind happened around 20 million years ago, and scientists believe the odds of it happening again are slim.&nbsp;&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why the natural diamond formation process cannot be copied!<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When it comes to natural diamond formation, there\u2019s simply no copying the process. This billion-year geological feat wasn\u2019t invented in a lab or engineered by scientists. It happened deep within the Earth through incredible amounts of heat, pressure and time.&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While scientists can replicate the chemical and optical <a href=\"https:\/\/adiamondisforever.com\/en-hk\/education\/is-my-diamond-natural-heres-how-to-tell\/\">properties of natural diamonds<\/a>, laboratory grown diamonds (also known as synthetic diamonds, <a href=\"https:\/\/adiamondisforever.com\/en-hk\/education\/natural-vs-lab-grown-diamonds-whats-the-difference\/\">lab-created diamonds and LGDs<\/a>) are produced in just a few weeks by one of two methods: High-Pressure, High-Temperature (HPHT) or Chemical Vapor Deposition (CVD).&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Expert gemologists can see the difference in crystal growth structures of natural diamonds and LGDs. Natural diamonds most often grow in an octahedral shape (like two pyramids stuck together base-to-base), while the crystals in CVD diamonds form in tab-like layers and those of HPHT diamonds grow in a more cube-like shape.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"677\" src=\"https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_Landscape-2-1024x677.jpg\" alt=\"Colored diamonds next to a lump of magma\" class=\"wp-image-614\" srcset=\"https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_Landscape-2-1024x677.jpg 1024w, https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_Landscape-2-300x198.jpg 300w, https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_Landscape-2-768x508.jpg 768w, https:\/\/adiamondisforever.com\/en-hk\/wp-content\/uploads\/sites\/4\/2025\/07\/B1.5-HowLongToForm_Landscape-2.jpg 1080w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Why origin matters when you\u2019re buying diamonds<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Now you\u2019ve got an understanding of how that glittering gemstone on your finger came to be, why is its origin something worth considering? Well, understanding a diamond&#8217;s origin \u2013 from deep within the Earth all those years ago, and the journey it\u2019s been on to get to you \u2013 is a way of elevating its meaning. A naturally formed diamond isn\u2019t just an accessory, but a cherished piece of our world&#8217;s history.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In fact, the ability to learn about a diamond\u2019s origin (something that\u2019s now possible when you shop with responsible diamond producers and sellers) is a whole topic in itself and many buyers are now seeking out third-party certifications and traceability initiatives to help verify a diamond\u2019s provenance. While fascinated to know the country and mine it was recovered in, people want to know that their gem has been sourced, handled and traded responsibly, too.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An billion-year backstory is also what sets natural diamonds apart from their lab-grown counterparts, which were manufactured in a matter of days or weeks. Knowing the incredible journey each natural diamond has been on serves as a reminder of its extraordinary endurance, rarity and wonder \u2013 something that simply can&#8217;t be rivalled.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Sources<\/strong><\/h4>\n\n\n<ol class=\"wp-block-footnotes\"><li id=\"109782d6-1c2d-4826-b091-2b6377890020\">Brilliance.com, History of diamonds <a href=\"#109782d6-1c2d-4826-b091-2b6377890020-link\" aria-label=\"Jump to footnote reference 1\">\u21a9\ufe0e<\/a><\/li><li id=\"a1c63df9-6cde-4796-9c99-f1227d8a1b05\">CBS News, Diamonds: a history <a href=\"#a1c63df9-6cde-4796-9c99-f1227d8a1b05-link\" aria-label=\"Jump to footnote reference 2\">\u21a9\ufe0e<\/a><\/li><li id=\"e88e5f16-f3a4-461d-9564-6e58d2f90c42\">Gemological Institute of America, Gemstone lore <a href=\"#e88e5f16-f3a4-461d-9564-6e58d2f90c42-link\" aria-label=\"Jump to footnote reference 3\">\u21a9\ufe0e<\/a><\/li><li id=\"659aa6bd-edb6-4be8-8626-6854685e376f\">Geologyscience.com, The role of high pressure and temperature in diamond formation <a href=\"#659aa6bd-edb6-4be8-8626-6854685e376f-link\" aria-label=\"Jump to footnote reference 4\">\u21a9\ufe0e<\/a><\/li><\/ol>","protected":false},"excerpt":{"rendered":"<p>Born from blistering heat and insane pressure, all that sparkle doesn\u2019t come easy! But that\u2019s exactly what makes natural diamonds so special&#8230;<\/p>\n","protected":false},"author":5,"featured_media":616,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"[{\"id\":\"109782d6-1c2d-4826-b091-2b6377890020\",\"content\":\"Brilliance.com, History of diamonds\"},{\"id\":\"a1c63df9-6cde-4796-9c99-f1227d8a1b05\",\"content\":\"CBS News, Diamonds: a history\"},{\"id\":\"e88e5f16-f3a4-461d-9564-6e58d2f90c42\",\"content\":\"Gemological Institute of America, Gemstone lore\"},{\"id\":\"659aa6bd-edb6-4be8-8626-6854685e376f\",\"content\":\"Geologyscience.com, The role of high pressure and temperature in diamond formation\"}]"},"categories":[9],"tags":[],"class_list":["post-584","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-about-natural-diamonds"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How Natural Diamonds Are Formed Over Billions of Years | A Diamond is Forever - 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