Lab-grown diamonds were first made reliably in December 1954, when a team at General Electric in the United States produced small synthetic diamond crystals using a high-pressure press. Those first stones were industrial grit, not gems. Gem-quality lab-grown diamonds large enough to cut and set did not arrive until around 1970, and did not reach ordinary jewellery shops until the 2000s.

When did lab diamonds start?

Lab diamonds started in a laboratory, not a jewellers, on 16 December 1954. That is the date a General Electric research team led by Tracy Hall made diamond from carbon in a way that could be repeated, using a “belt” press that squeezed carbon at enormous pressure and temperature. General Electric announced the achievement in February 1955. The crystals were tiny, dark and useful for cutting and grinding tools. Nobody at the time was thinking about engagement rings.

Who invented the lab-grown diamond?

No single person invented the lab-grown diamond, but Tracy Hall is the name most closely attached to the first repeatable success. Hall worked at General Electric with Herbert Strong, Robert Wentorf and James Cheney, and he designed the belt press that made the 1954 result possible. A Swedish team at the engineering company ASEA had produced small diamonds in February 1953, roughly two years earlier, but did not publish the work at the time, so the credit historically went to General Electric.

Why did earlier attempts fail?

Earlier attempts to make diamonds failed because nobody could reach the pressures involved and nobody could prove their results. The starting point was 1797, when the English chemist Smithson Tennant burned a diamond and showed it was nothing but carbon — the same element as soot and pencil lead. That made the goal obvious and the method impossible. Through the nineteenth century several chemists, including Henri Moissan in the 1890s, claimed success. None of the claims could be reproduced by anyone else, which in science means they do not count.

When were lab-created diamonds first made as gems?

Gem-quality lab-created diamonds first appeared around 1970, when General Electric grew synthetic crystals large enough to be cut into faceted stones. They were an expensive scientific demonstration rather than a product — it cost more to grow one than to dig one up. The second growth method, chemical vapour deposition, has an even longer run-up: William Eversole at Union Carbide grew diamond from carbon-rich gas in the early 1950s, but CVD did not produce colourless stones of a size worth setting until decades later.

A timeline of lab-grown diamonds

The dates below track the journey from a chemistry experiment to something you can buy as an engagement ring.

Date	What happened
1797	Smithson Tennant proves a diamond is pure carbon
1890s	Henri Moissan and others claim to have made diamonds; no claim can be reproduced
Early 1950s	William Eversole at Union Carbide grows diamond from gas — the origin of the CVD method
February 1953	The ASEA team in Sweden makes small diamonds but does not announce it
16 December 1954	General Electric makes diamond repeatably; announced February 1955
Around 1970	General Electric grows the first gem-quality synthetic diamonds large enough to cut
Early 2000s	The first companies begin selling gem lab-grown diamonds to the public
2018	The US Federal Trade Commission removes the word “natural” from its definition of a diamond in its Jewelry Guides
2010s onward	CVD becomes the main route for large colourless gem stones; prices fall sharply

When did lab-grown diamonds reach jewellery shops?

Lab-grown diamonds reached jewellery shops in the early 2000s, when the first companies started selling gem-quality grown stones to the public — initially HPHT-grown, often in fancy yellow, because colourless was still hard to achieve at size. Colourless CVD stones followed. The change that mattered for ordinary buyers came in the 2010s, when growth capacity expanded, quality became consistent and prices dropped far enough that a lab-grown centre stone became the sensible default rather than the curiosity.

Are lab-grown diamonds a new invention?

Lab-grown diamonds are not a new invention. The chemistry is over seventy years old and industrial synthetic diamond has been in everyday use since the 1950s in drill bits, saw blades, grinding wheels and, later, electronics. What is genuinely new is the scale and the quality: growing a colourless stone of two or three carats, cleanly enough to certify and cut, is a development of the last fifteen years or so. When someone says lab-grown diamonds are “new”, they usually mean new to the high street.

What changed the law and the labels?

The most important recent date for buyers is 2018, when the US Federal Trade Commission revised its Jewelry Guides. It removed the word “natural” from its definition of a diamond, confirming that a laboratory-grown stone is a diamond, and it discouraged sellers from using the misleading word “synthetic”. That is why reputable sellers now write “lab-grown diamond” or “laboratory-grown diamond” on listings and reports. Our guide to what a lab diamond is properly called covers the approved and unapproved names in full.

What this history means when you are buying

Seventy years of development is why a lab-grown diamond today is a settled, certified product rather than an experiment. Every CarbonstoneUK centre stone comes with a free IGI certificate and is hand-made into solid gold or platinum at our workshop in North Harrow, London. If you want to see what the modern end of that timeline looks like, the Solitaire Round Cut Engagement Ring in White Gold at £563 and the Solitaire Oval Cut Engagement Ring at £557 are good starting points, with the Solitaire Emerald Cut Engagement Ring at £672 for anyone who prefers a step cut (prices correct at the time of writing).

Frequently asked questions

When were lab created diamonds invented?

Lab created diamonds were invented in stages. Diamond was proved to be carbon in 1797, small diamonds were made repeatably by General Electric in December 1954, gem-quality stones large enough to cut arrived around 1970, and lab-grown gems reached the public in the early 2000s. The industry only became large and affordable in the 2010s.

Who made the first lab-grown diamond?

The first reproducible lab-grown diamonds are credited to Tracy Hall and colleagues at General Electric in 1954. A Swedish team at ASEA made diamonds in February 1953 but kept the result unpublished, so General Electric received the public credit. Neither result produced a stone anyone could have set in a ring.

How old is the technology behind lab diamonds?

The high pressure, high temperature method dates from the early 1950s, and chemical vapour deposition also has roots in that decade. So the underlying technology is roughly seventy years old. The specific ability to grow large, colourless, gem-clean crystals reliably is much more recent, developed largely over the past fifteen years.

Are lab-grown diamonds a fad?

A material that has been manufactured continuously since the 1950s and is used in industry worldwide is not a fad. What is fair to say is that lab-grown diamonds as jewellery are still a young market, which is why prices have moved a great deal. Our post on what percentage of diamonds are lab-grown explains why we do not quote market share figures.

Did the first lab diamonds look like the ones sold today?

No. The 1954 General Electric crystals were tiny, dark and irregular — suitable for industrial cutting tools and nothing else. Today’s gem stones are grown to specified colour and clarity, laser-inscribed, and graded on the same D-to-Z colour and FL-to-I3 clarity scales as mined diamonds by laboratories including IGI and GIA.

How are lab diamonds made now?

Two methods are used: HPHT, which squeezes carbon at high pressure and temperature much as the 1954 process did, and CVD, which builds a crystal atom by atom from carbon-rich gas. CVD dominates for large colourless stones. Our guide to how lab-grown diamonds are made goes through both.

Is a lab-grown diamond chemically the same as one made in 1954?

Chemically yes — both are crystalline carbon. The difference is control. The 1954 process could produce diamond but not choose its size, colour or clarity. Modern growth runs are tuned deliberately, which is why colourless D to F grades are far more common in lab-grown diamonds than they are in mined ones.

Where to look next

If the history has convinced you, the practical questions come next: what the stone costs, what the certificate says and which shape suits the hand. Have a browse of our lab-grown diamond engagement rings, or read the difference between a lab-grown and a natural diamond. Everything we make is hand-made in solid gold or platinum, comes with free insured UK delivery and 30-day returns, and can be made bespoke at no extra design cost if you want something we do not stock.