Sunday, May 19, 2024

10 interesting facts you didn’t know about diamonds

Diamonds have long been celebrated for their unmatched beauty and incredible physical properties. They are symbols of love, power, and wealth, deeply embedded in human culture. Despite their popularity, many intriguing aspects of diamonds remain lesser-known. This article explores ten fascinating facts about diamonds that will enrich your understanding and appreciation of these extraordinary gemstones.


1. Diamonds Are Not the Rarest Gemstone

Contrary to popular belief, diamonds are not the rarest gemstones. While diamonds are highly sought after and command significant market prices, they are more abundant than several other precious stones. Gemstones like tanzanite, alexandrite, and certain varieties of garnet are much rarer than diamonds. The perceived rarity of diamonds is largely a result of marketing strategies employed by major diamond companies, particularly De Beers, which has controlled the diamond market for decades. By regulating the supply and creating a perception of scarcity, these companies have successfully maintained high prices for diamonds.


2. Diamonds Form Deep Within the Earth

The journey of a diamond from deep within the Earth to the surface is nothing short of extraordinary. Diamonds form under extreme pressure and temperature conditions found about 100 miles (160 kilometers) below the Earth’s surface in the mantle. These conditions are typically met in stable areas of the Earth’s mantle called “cratons.” The formation process takes millions to billions of years. Diamonds reach the Earth’s surface through volcanic eruptions, carried by a special type of magma known as kimberlite. This violent and rapid transportation process, which can occur over a few hours, ensures that diamonds do not convert to graphite, a more stable form of carbon at lower pressures.

3. The Cullinan Diamond is the Largest Ever Found

The Cullinan Diamond, discovered in South Africa in 1905, holds the record for the largest gem-quality diamond ever found, weighing an astounding 3,106 carats (about 1.37 pounds). The rough diamond was eventually cut into several polished gems, the largest of which is the Cullinan I, or the Great Star of Africa, weighing 530.2 carats. This gem is set in the Sovereign’s Sceptre with Cross, part of the British Crown Jewels. Other significant stones cut from the Cullinan include the Cullinan II, set in the Imperial State Crown, and several smaller diamonds incorporated into various pieces of the British Crown Jewels.

4. Diamonds Can Form in Space

Diamonds are not exclusive to Earth; they can also form in space. In fact, scientists have discovered nanodiamonds in meteorites, suggesting that these tiny diamonds formed in the supernova explosions of stars. The intense pressure and heat from such cosmic events provide the perfect conditions for diamond formation. Additionally, some research suggests that the interiors of certain planets, like Neptune and Uranus, may contain oceans of liquid diamond with floating solid diamond “icebergs.” These interstellar diamonds provide a fascinating glimpse into the complex processes at play in our universe.

5. Synthetic Diamonds are Virtually Identical to Natural Diamonds

Technological advancements have enabled the creation of synthetic diamonds that are virtually indistinguishable from natural diamonds. Synthetic diamonds are produced using two primary methods: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD). HPHT simulates the natural conditions under which diamonds form, while CVD grows diamonds from a carbon-rich gas mixture. These lab-grown diamonds have the same physical, chemical, and optical properties as natural diamonds and are increasingly popular due to their ethical and environmental benefits. With the naked eye, and often even with standard gemological equipment, it is challenging to distinguish synthetic diamonds from their natural counterparts.

6. The World’s Most Expensive Diamond

The title of the world’s most expensive diamond is held by the Pink Star, a 59.60-carat fancy vivid pink diamond. The Pink Star was sold at a Sotheby’s auction in Hong Kong for a staggering $71.2 million in April 2017. This incredible diamond, originally mined by De Beers in Africa in 1999, took over 20 months to cut and polish. Its value is derived from its exceptional size, flawless clarity, and vivid pink color, making it one of the most unique and desirable diamonds in the world.

7. Diamonds Can Be Found in Meteorites

In addition to forming in space, diamonds can also be found in meteorites that have fallen to Earth. One famous example is the Allende meteorite, which fell in Mexico in 1969. This meteorite contains microscopic diamonds formed under the intense pressure of a supernova explosion. These diamonds are much older than those found on Earth, providing scientists with valuable information about the early solar system and the processes that took place during its formation. The study of meteorite diamonds continues to offer insights into the origins and evolution of our planetary system.

8. Some Diamonds Glow Under Ultraviolet Light

A lesser-known property of some diamonds is their ability to fluoresce, or glow, under ultraviolet (UV) light. About 25-35% of natural diamonds exhibit this phenomenon, typically glowing blue, although other colors such as yellow, green, and red can also occur. Fluorescence in diamonds is caused by the presence of trace elements like nitrogen or boron. While fluorescence can affect a diamond’s appearance and value, its impact is often subjective. In some cases, fluorescence can enhance a diamond’s visual appeal by making it appear whiter under certain lighting conditions, while in other cases, it may cause the diamond to appear hazy or oily.

9. The First Recorded Diamond Engagement Ring

The tradition of giving diamond engagement rings dates back to 1477, when Archduke Maximilian of Austria presented a diamond ring to Mary of Burgundy. This gesture is considered the first recorded instance of a diamond engagement ring. The ring featured thin, flat pieces of diamonds arranged in the shape of an “M.” This event set a precedent among European aristocracy and nobility, establishing diamonds as the ultimate symbol of love and commitment. The practice gained widespread popularity in the 20th century, particularly after De Beers’ iconic “A Diamond is Forever” marketing campaign in 1947, which solidified diamonds’ association with romance and marriage.

10. Diamonds Have Unusual Hardness and Other Unique Properties

Diamonds are renowned for their unparalleled hardness, which makes them incredibly durable and resistant to scratching. This property is due to the strong covalent bonds between carbon atoms in the diamond lattice structure. On the Mohs scale of mineral hardness, diamonds rank as the hardest natural substance with a rating of 10. However, diamonds are not indestructible; they can be chipped or fractured if struck with sufficient force along certain planes.

In addition to their hardness, diamonds have several other unique properties. They are excellent thermal conductors, meaning they can efficiently transfer heat. This property is utilized in various industrial applications, such as cutting tools and heat sinks for electronic devices. Diamonds also have a high refractive index and dispersion, which contribute to their brilliance and fire when cut into gemstones. These optical properties make diamonds the most dazzling of all gems, captivating admirers with their intense sparkle and play of light.


Diamonds are far more than just beautiful gemstones. Their formation, properties, and cultural significance make them a subject of endless fascination. From their deep origins within the Earth’s mantle to their presence in space, diamonds tell a story of immense pressure, time, and transformation. Whether natural or synthetic, large or small, diamonds continue to capture human imagination and symbolize a myriad of values and emotions.

Understanding these ten fascinating facts about diamonds enriches our appreciation of these extraordinary gems, reminding us of the natural and scientific marvels that contribute to their creation and allure. Whether admired in a piece of jewelry or studied for their unique properties, diamonds remain one of nature’s most remarkable creations, celebrated for their beauty and mystery.

Related topics:


Related Articles

Latest Articles