How Are Diamonds Made?

How Are Diamonds Made?

The Remarkable Tale of Diamonds: An Insight From Bella Cosa Jewelers, Chicago


Welcome to the sparkling realm of diamonds, brought to you by Bella Cosa Jewelers - Chicago's top-rated family-owned jewelry store. Just as each diamond has its unique story, so does our dedication to serving over 30,000 satisfied customers. Together, let's delve into the captivating journey of diamonds, from their birth deep within the Earth to their transformation into stunning pieces of jewelry.

Diamonds: Born Deep Within the Earth

As a jeweler that values quality, Bella Cosa Jewelers understands the unique origins of every diamond. Formed over 100 miles beneath the Earth's surface, diamonds require a precise combination of extreme heat and pressure. The temperatures required exceed 2,200 degrees Fahrenheit, and the pressure needed is about 725,000 pounds per square inch. These extraordinary conditions lead to the bonding of carbon atoms in a distinctive way, resulting in a gemstone unparalleled in hardness and brilliance.

The Transformation: From Carbon to Diamond

Diamonds may be the hardest mineral, but did you know they originate from carbon, the same element found in one of the softest minerals, graphite? Here at Bella Cosa Jewelers, we understand the intricate process that transforms carbon into a sparkling diamond:

  1. Carbon Source: Within the Earth, carbon-bearing materials experience extreme heat and pressure over billions of years.
  2. Crystallization: Carbon atoms bond in a unique crystalline structure under these intense conditions. Each carbon atom connects with four others in a tetrahedral arrangement, resulting in the signature hardness and brilliance of diamonds.
  3. Journey to the Surface: Diamonds must then travel from the Earth's depths to the surface, facilitated by deep-source volcanic eruptions. These eruptions create kimberlite and lamproite pipes, transporting diamonds along with other minerals and rocks to the surface.

Discovering Diamonds: Unearthing Treasures

At Bella Cosa Jewelers, we know the significance of the sources that bring diamonds to the surface - kimberlite and lamproite pipes. However, identifying these diamondiferous pipes, those that contain diamonds, is no easy task. It requires extensive knowledge and patience, much like the customer-first approach that has earned us over 600 5-star reviews.

Unveiling the Gems: The Art of Diamond Mining

Extracting diamonds from the Earth is an elaborate process. Diamonds can be mined through pipe mining and alluvial mining:

  1. Pipe Mining: This method involves digging into the Earth to extract diamonds from their source directly. It includes open-pit mining, where a large hole is dug to access the pipe, and underground mining, which involves tunneling to reach deeper sections of the pipe.
  2. Alluvial Mining: Diamonds that have been carried away by natural forces from their primary source can be found in oceans, beaches, or riverbeds. Miners sift through these deposits, known as alluvial deposits, to find diamonds.

A New Era of Diamonds: Lab-Grown Creations

In our commitment to offer you the best variety, Bella Cosa Jewelers also provides lab-grown diamonds. These diamonds, though man-made, are chemically and physically identical to natural diamonds. They are created using two primary methods:

  1. High Pressure, High Temperature (HPHT): This method emulates the natural conditions for diamond formation. A carbon source is subjected to high pressure and high temperature until it crystallizes into a diamond.
  2. Chemical Vapor Deposition (CVD): This process involves placing a small diamond seed in a sealed chamber filled with a carbon-rich gas. When heated, the gas decomposes, and the carbon atoms attach to the diamond seed, growing it layer by layer.


The journey of a diamond, whether originating deep within the Earth or created in a laboratory, is nothing short of awe-inspiring. It's a journey that Bella Cosa Jewelers is honored to be a part of, transforming these unique gems into pieces that symbolize love, power, and beauty.

Understanding how diamonds are made enhances our appreciation of them and helps us better serve you. So, whether you're considering purchasing a diamond or fascinated by these sparkling wonders, remember that each diamond carries a billion-year journey. Just like every diamond has a story, so does each piece of jewelry at Bella Cosa Jewelers. Join us in one of our Chicago area stores, where our expert team is ready to help you discover the perfect diamond for your story.

Looking for a loose diamond? We have loaded inventory we have in stock at either of our Chicago showrooms right on our website. Take a look at our inventory here:

Natural Loose Diamonds

Lab Grown Diamonds

For more info on Bella Cosa Jewelers diamonds, visit our diamond info page here: