Fascinating Facts About Lab Grown Diamonds Explained

Lab-grown diamonds have moved firmly into the mainstream, and nowhere is that shift more visible than in Hatton Garden, the EC1N heart of London's diamond quarter. These stones are chemically, physically and optically identical to mined diamonds, sharing the same brilliance and hardness. What separates them is origin: they form inside a controlled chamber rather than deep underground. For buyers exploring an engagement ring or a fine piece near Greville Street and Leather Lane, understanding how lab-grown diamonds are made, certified and valued helps you choose with clarity. Here are the facts worth knowing before you visit a jeweller.

How Lab-Grown Diamonds Are Made

Despite a common misconception, lab-grown diamonds are not assembled like manufactured parts. Carbon crystallises gradually inside a chamber under intense heat and pressure, or through chemical vapour deposition, forming rough stones that are then cut and polished using the same techniques as mined diamonds. Many lab-grown diamond specialists in the quarter source these stones from established producers.

The technology itself is far from new. General Electric created the first reproducible synthetic diamonds in the 1950s, though gem-quality results suitable for jewellery only became widely available in recent years as methods improved.

Quality, Colour and Certification

Early lab-grown stones often carried a yellow tint and commanded high costs. Refined production now delivers clean, colourless results at accessible prices, alongside vivid fancy colours such as pink, blue and yellow that are rare and costly in mined diamonds.

Certification matters just as much here as with natural stones. Reputable laboratories such as GIA and IGI grade lab-grown diamonds on the same cut, clarity, colour and carat scale, and the report should clearly state the stone is laboratory grown.

Fun fact: A lab-grown diamond can be created in a matter of weeks, while a natural diamond takes between 1 and 3 billion years to form.

Shapes, Sustainability and Choice

Growing popularity has widened the range of available cuts, from classic round brilliants to marquise, emerald and rose cuts, with bespoke options for buyers wanting something distinctive. Larger carat weights also become more attainable at a given budget.

Sustainability draws many buyers too. Some producers now use renewable energy and recycle materials, appealing to those weighing ethics alongside beauty. Younger shoppers in particular value traceable, responsibly made stones.

Choosing in Hatton Garden

The decision between mined and lab-grown ultimately rests on personal values and budget. Both are real diamonds, and both can anchor a meaningful piece. Visiting EC1N lets you compare stones in person, with Farringdon, Holborn and Chancery Lane all close by, and speak directly with jewellers who set them every day.

For our most complete and up-to-date advice on this topic, read our complete guide to lab grown diamonds in Hatton Garden.