How Diamonds Are Made

Natural diamonds were formed billions of years ago from carbon that was exposed to extremely high pressures and temperatures 20km to 120km below the surface of the earth.

Rough diamonds are found in many shapes and sizes, though often they are broadly octahedral (like two pyramids stuck base-to-base). Before they are cut and polished, they are sorted according to their size and quality. 

Transforming them into sparkling gemstones takes great skill and extensive training with specialist tools.  The diamond cutter also needs to know how to maximise the value of the finished diamond by minimising wastage while trying also to optimise its clarity and cut grades.

The round brilliant cut is overwhelmingly the most popular shape for a cut diamond. Our diamond cuts page may help you choose the perfect diamond for your custom-made engagement ring or piece of bespoke jewellery. 

Once a diamond has been cut and polished, it is weighed and graded for colour, clarity and cut. If this is performed by an independent laboratory then the diamond may be called a certified diamond. You can read more about the four Cs of carat, colour, clarity and cut on our diamond grading page.

At Ingle & Rhode, we also insist on a fifth C: conflict-free. We source only ethical diamonds, that have been mined cut and polished without human exploitation.

Do get in touch if you have any questions about any of these issues or if you would like to learn more about our bespoke jewellery service.