# Long Tons to Carats (long tn to ct) Source: https://www.unitconvertercalculator.com/weight/long-tons-to-carats/ **1 long tn = 5080234.544 ct** One long ton equals approximately 5,080,235 carats. The long ton at 2,240 pounds (about 1,016 kg) is the heavyweight champion of British Imperial measurement, while the carat at 0.2 grams is the delicate unit of the diamond trade. Over five million carats per long ton underscores the staggering scale gap between bulk industrial measurement and gemological precision. ## Formula Apply the conversion factor ## Conversion Table | Long Tons (long tn) | Carats (ct) | |---|---| | 0.001 long tn | 5080.234544 ct | | 0.005 long tn | 25401.17272 ct | | 0.01 long tn | 50802.34544 ct | | 0.05 long tn | 254011.7272 ct | | 0.1 long tn | 508023.4544 ct | | 0.5 long tn | 2540117.272 ct | | 1 long tn | 5080234.544 ct | | 2 long tn | 10160469.088 ct | | 5 long tn | 25401172.72 ct | | 10 long tn | 50802345.44 ct | | 50 long tn | 254011727.2 ct | | 100 long tn | 508023454.4 ct | ## Units ### Long Ton (long tn) A long ton (imperial ton) is a unit of mass equal to exactly 2,240 pounds or 1,016.0469088 kilograms. It is used primarily in the United Kingdom for shipping and naval displacement. ### Carat (ct) A carat is a unit of mass equal to exactly 200 milligrams (0.2 grams), used for measuring gemstones and pearls. Adopted internationally in 1907 by the Fourth General Conference on Weights and Measures. ## Background Diamond mining bridges these two extremes daily. Mines move thousands of long tons of kimberlite ore to extract a handful of carats. The Jwaneng mine in Botswana processes roughly 9 million long tons of ore annually to produce about 12 million carats of diamonds - a recovery rate of roughly 1.3 carats per long ton of earth. This conversion quantifies the remarkable rarity that makes diamonds valuable. ## Good to Know The relationship between long tons and carats tells the story of diamond mining's extraordinary economics. When diamonds were first discovered near Kimberley, South Africa, in 1867, the ore was measured in long tons and the gems in carats - creating a permanent dual-unit system at every mine. Cecil Rhodes' De Beers consolidated mining operations tracked tonnage of ore processed alongside carats recovered, and the ratio of carats per ton became the key metric that determined whether a mine was profitable or worthless. This tons-to-carats relationship remains the fundamental equation of diamond economics today. ## FAQ ### How many carats are in one long ton? Approximately 5,080,235 carats. One long ton equals about 1,016,047 grams, and each carat is 0.2 grams, so 1,016,047 divided by 0.2 gives roughly 5,080,235. ### How many carats of diamonds does a long ton of ore typically yield? It varies enormously by mine. Rich kimberlite pipes yield 1 to 3 carats per long ton of ore. Alluvial deposits may yield more. The richest mines in history reached 5 or more carats per ton. At most diamond mines, you must process millions of carats' worth of rock to extract a few hundred carats of gem-quality stones. ### What would a long ton of pure diamonds be worth? A long ton of gem-quality diamonds (over 5 million carats) would be worth tens of billions of dollars - more than the annual GDP of many countries. Such a quantity has never existed in one place. The entire global annual diamond production is only about 130 million carats, or roughly 26 long tons, spread across dozens of mines worldwide. ## Non-Frequently Asked Questions ### If Scrooge McDuck swam in a vault of diamonds measured in long tons, how many carats deep would it be? A long ton of diamonds would occupy roughly 290 liters due to diamond's density of 3.51 g/cm3. Piled in a vault, it would form a heap about knee-high - not deep enough for swimming. You would need at least 10 long tons (50 million carats) to wade in, and hundreds of long tons for the full swimming experience. Even by cartoon billionaire standards, this is excessive. ### Has any ship ever carried a long ton of diamonds? It is extremely unlikely that a full long ton of processed diamonds has ever been on a single ship. The entire De Beers stockpile at its peak was estimated at around 20 million carats, or roughly 4 long tons. Moving a full long ton of diamonds would require extraordinary security - roughly the value of a small nation's entire economy concentrated in a space the size of a bathtub. ### If I found a carat of diamond in every long ton of my garden soil, would I be rich? One carat per long ton is about the recovery rate of a productive diamond mine. If your garden contains 100 long tons of soil (a modest garden to about 1 meter depth), you would have roughly 100 carats of diamonds - potentially worth $50,000 to $500,000 depending on quality. Unfortunately, you would also need industrial mining equipment costing millions to extract them. ## Related Articles - [Why We Measure: The Deepest Urge in Human Civilisation](https://www.unitconvertercalculator.com/blog/why-we-measure) - [The Map Is Not the Territory: Why Every Measurement Is Wrong](https://www.unitconvertercalculator.com/blog/the-map-is-not-the-territory) - [Zero: The Most Dangerous Number in Measurement](https://www.unitconvertercalculator.com/blog/zero-the-most-dangerous-number-in-measurement) - [The Kilogram Problem: The Object That Was Its Own Definition](https://www.unitconvertercalculator.com/blog/the-kilogram-problem) - [The Body as a Ruler: Every Measurement Unit That Came From Us](https://www.unitconvertercalculator.com/blog/the-body-as-a-ruler) - [Why Your Recipe Is Lying to You: The Chaos of Cooking Measurements](https://www.unitconvertercalculator.com/blog/why-recipe-measurements-are-unreliable) - [15 Obscure Measurement Units You've Never Heard Of (But Still Need)](https://www.unitconvertercalculator.com/blog/obscure-measurement-units-guide) - [When Measurements Go Wrong - Disasters, Blunders and Happy Accidents](https://www.unitconvertercalculator.com/blog/when-measurements-go-wrong) - [The Surprising Stories Behind Everyday Units of Measurement](https://www.unitconvertercalculator.com/blog/stories-behind-measurement-units) - [Metric vs. Imperial - The Complete Guide to the World's Two Measurement Systems](https://www.unitconvertercalculator.com/blog/metric-vs-imperial-complete-guide) - [Understanding Weight Units - Kilograms, Pounds, Stones & Ounces](https://www.unitconvertercalculator.com/blog/understanding-weight-units) - [Complete Baking Measurement Guide - Cups, Grams, Ounces](https://www.unitconvertercalculator.com/blog/baking-measurement-guide) ## See Also - [Carats to Long Tons](https://www.unitconvertercalculator.com/weight/carats-to-long-tons/)