India, specifically, was the world\u2019s sole diamond source for more than 3,000 years; many historians believe that India was trading in diamonds as early as the fourth century BC.2<\/a><\/sup><\/p>\n\n\n\n As per the accounts of the French gem merchant Jean-Baptiste Tavernier, who travelled across the country at the time, India\u2019s diamond deposits were extensive. He recorded how there were over 20 mines in the erstwhile kingdom of Golconda, which was home to some of the world\u2019s most fabled natural diamonds such as the Koh-i-Noor and the Hope Diamond.3<\/a><\/sup><\/p>\n\n\n\n Yet even these rich tales are only the second chapter. The first was written billions of years ago, when diamonds were forged under extreme conditions deep underground.<\/p>\n\n\n\n You know what they look like when set in beautiful pieces of jewellery, 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 crystallised deep beneath the Earth\u2019s surface under intense heat and pressure.<\/p>\n\n\n\n Diamonds have a unique crystal lattice structure, wherein each carbon atom is bonded to four others. This is what gives natural diamonds their exceptional strength and hardness.<\/p>\n\n\n\n Lab-grown stones, on the other hand, by virtue of being mass produced in batches, don\u2019t possess the same enduring value. They can be manufactured very quickly, sometimes in the span of just three days!<\/p>\n\n\n\n The 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 kilometres beneath the surface. Some rare diamonds may even originate from depths of 700 to 800 kilometres.<\/p>\n\n\n\n Down there, conditions are extreme: temperatures soar to over 1,200\u00b0C 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!<\/p>\n\n\n\n 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, colour and clarity. That\u2019s why gemmologists are so obsessed with studying them.<\/p>\n\n\n\n Each gemstone reveals a tiny, glittering clue about the epic geological events happening beneath our feet.<\/p>\n\n\n\n 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.<\/p>\n\n\n\n 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 kilometres below ground, carrying diamonds along with it. As it cooled, it formed vertical, carrot-shaped pipes called kimberlites.<\/p>\n\n\n\n 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.<\/p>\n\n\n\n When it comes to natural diamond formation, there\u2019s simply no replicating the process. This billion-year geological feat wasn\u2019t invented in a lab or engineered by scientists. Lab-grown stones are producedby one of two methods: High-Pressure, High-Temperature (HPHT) or Chemical Vapor Deposition (CVD).<\/p>\n\n\n\n Expert gemmologists can see the difference in crystal growth structures of natural diamonds and LGDs. To make sure you\u2019re investing in the diamond of your choice, always insist on proof of certification at the time of purchase. It serves as a stamp of authenticity.<\/p>\n\n\n\n Why is it so important to understand how diamonds are formed? Being aware of your natural diamond\u2019s provenance, and how it travelled from deep within the Earth all those years ago to get to you, is a way of elevating its meaning. A naturally formed diamond isn\u2019t just an accessory, but a cherished piece of our world\u2019s history.<\/p>\n\n\n\n Whether it\u2019s a pair of diamond hoops for your mother or a bracelet for your best friend, knowing the story behind natural diamonds makes your gift even more sentimental. A gemstone that took billions of years to form carries an emotional weight that few other presents can match.<\/p>\n\n\n\n Origin also builds trust. Traceability and certification reassure you that your diamond has been sourced and traded responsibly, making your choice feel even more significant.<\/p>\n\n\n\n And finally, a billion-year backstory is what sets natural diamonds apart from their lab-grown counterparts. Knowing the incredible journey each natural diamond has been on serves as a reminder of its extraordinary endurance and rarity \u2014 something that simply can\u2019t be rivalled.<\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" The hard, arduous journey undertaken from deep within the Earth\u2019s surface is exactly what makes natural diamonds so special…<\/p>\n","protected":false},"author":8,"featured_media":477,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"[{\"content\":\"The Hindu, Human presence in India dates back to 1.5 million years\",\"id\":\"8a17d4b4-6353-401f-bf75-199130ccbb70\"},{\"content\":\"GIA, Diamond History and Lore\",\"id\":\"4b61ddb1-d24c-4635-92de-4b1ddc5b3770\"},{\"content\":\"Smithsonian, History of the Hope Diamond\",\"id\":\"10486f8c-a53c-471d-8e0a-76368efc4c21\"}]"},"categories":[4],"tags":[],"class_list":["post-481","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-education"],"acf":[],"yoast_head":"\n![\"A](\"https:\/\/adiamondisforever.com\/en-in\/wp-content\/uploads\/sites\/2\/2025\/11\/B1.5-HowLongToForm_RightPortrait.jpg.jpg\")
<\/figure>\n\n\n\n![\"A](\"https:\/\/adiamondisforever.com\/en-in\/wp-content\/uploads\/sites\/2\/2025\/11\/B1.5-HowLongToForm_LeftPortrait.jpg.jpg\")
<\/figure>\n<\/figure>\n\n\n\nHow are natural diamonds formed?<\/h2>\n\n\n\n
How geological conditions shape natural diamond formation<\/h2>\n\n\n\n
How natural diamonds travel from core to creation<\/h2>\n\n\n\n
Why only nature can shape a true natural diamond<\/h2>\n\n\n\n
![\"rough](\"https:\/\/adiamondisforever.com\/en-in\/wp-content\/uploads\/sites\/2\/2025\/11\/B1.5-HowLongToForm_Landscape-2.jpg-1024x677.jpg\")
<\/figure>\n\n\n\nThe importance of origin when you\u2019re buying diamonds<\/h2>\n\n\n\n
Sources<\/h3>\n\n\n