What are laboratory grown diamonds?

To understand what synthetic or 'lab-grown' diamonds are, you first need to know what a diamond is and what's on the market as an alternative. You'll notice I mix between the terms 'synthetic' and 'lab- grown'. Scientists and Gemmologists often refer to diamonds grown in a laboratory or factory as synthetic diamonds, so you'll become familiar with both terminologies. Retailers often prefer the term 'laboratory grown' so as not to get confused with other stones which can be used to replicate diamonds. 
Natural diamonds are grown over billions of years from the carbon present in the earth. The stones are mined by humans from the earth, river and sea. The crystals are then polished, producing diamond gemstones. Diamonds are rare and are therefore expensive. So far time has told us that they only increase in value.
Diamond simulants can look very similar to diamonds but do not have the same properties. These can be natural simulants (a material or mineral grown in the earth) like clear colourless sapphire, topaz or zircon, which do not have the same chemistry or crystal structure as a diamond. They are usually less expensive and tend to be less rare than diamonds.
There are also artificial simulants (grown in laboratories) such as cubic zirconia, moissanite and synthetic clear colourless sapphire. Again, they do not have the same properties or crystal structure as a diamond and are grown in a laboratory, therefore easily and readily re-produced and very cheap in comparison to a natural diamond.
Synthetic or lab-grown diamonds, have the same properties, characteristics and chemistry of a natural diamond. They are produced in an environment that mimics their creation beneath the earth. Unlike diamonds, these are made in days to weeks instead of billions of years. Currently prices are 30-50% cheaper than natural diamonds- giving you a bigger stone for your money! 

An artificial simulant example.

A cubic zirconia bracelet from our Jools collection.

Shop our full Jools range here

A natural simulant example.

A laboratory grown diamond example.

Shop our beautiful laboratory grown diamond collection here!



People have been trying to grow diamonds for centuries now- ever since it was discovered that they were made from carbon. After realising they were created from high temperatures and pressures beneath the earth's surface, scientists started their research into man- made crystals.

The first company to publish their results creating a synthetic diamond was General Electric in America. In 1954 they finally had a break through and grew the first lab- grown diamond. Over time the shapes and sizes could be better controlled and more consistent when reproduced. 
98% of today's industrial diamonds are grown synthetically and are used in the oil industry and manufacturing.

How are lab- grown diamonds made?

The two ways to produce synthetic diamonds are high pressure high temperature (HPHT) and chemical vapor deposition (CVD). They are used for slightly different purposes but both produce high quality crystals to use in jewellery. In both methods a refined carbon source is used starting with a seed crystal to initiate growth. Once the stones are made, people then polish and cut them to produce a polished laboratory grown diamond. 
HPHT is based on the initial discovery back in the 1950's. The process mimics the condition natural diamonds are formed in the earth's surface over billions of years; using high pressures and high temperatures of around 1300-1600 degrees Celsius., but instead of billions of years, only takes weeks to produce. HPHT is most commonly used to create diamonds up to 0.15ct, often referred to as "melee". A company in Russia have used this method to produce larger stones, but it is currently more cost effective making smaller crystals and leaving the larger stones to CVD.
Chemical Vapor Deposition (CVD) uses moderate to high temperatures of around 700-1000 degrees Celsius and lower pressures than HPHT. Diamond seeds are placed in a plate spaced apart, meaning multiple diamonds can be grown at once. These stones grow upwards in thin layers and often have a brownish finish. They are then put into a HPHT machine to burn the brown off, leaving the crystals clear. Larger stones created using CVD often take around a month to form- so not too dissimilar to HPHT.

Natural vs Lab- grown

I wouldn't necessarily say there is a competition between the two stones. It really depends on what you would like out of your jewellery piece. Diamonds have the rare factor and therefore the value, historically, continues to rise. If people had the choice and didn't take price into consideration, most would go for a natural stone every time. If you like the look of a larger stone, lab- grown diamonds are often 30-50% cheaper than natural- so you certainly get more for your money. However, with them being easily and quickly reproduced, it is unlikely that they will hold their value and would certainly have a lower resale price tag. So, if you're investing in a diamond jewellery piece- natural would be the way to go.
Ethically, yes, it's true that lab- grown diamonds don't have the mining conflict associated with them like natural diamonds do, but with work in place like the Kimberley Process, participants actively prevent 99.8% of worldwide trade. However, in terms of sustainability, the electricity needed to create a synthetic stone using CVD is the equivalent of powering a home for a month. That being said, the process takes roughly a month from start to finish and if the power was created from solar panels, could this make a huge difference? Sustainability is a huge focus in the world right now, shown from clothing retailers using recycled materials all the way up to The Earthshot prize, awarded to businesses doing their best to come up with solutions that help the environment. 
The wonderful thing about natural and lab-grown diamonds is that you have a choice! Here, at Avanti we are now able to offer a lab-grown diamond option yet continue to specialise in beautiful natural diamond pieces.

Can you tell the difference?

Honestly, no. To the naked eye and even through a loupe glass, you can't see a difference. You would have to send off to have the stone examined with the correct technology. With this technology there are several ways to tell a natural diamond apart from a synthetic one. Both natural and laboratory grown diamonds share the same chemical, physical and optical properties. They are both made from crystalline carbon and a 10 on the hardness scale. The only difference is how and where the diamonds are grown and the length of time. It is these growth histories that a laboratory uses to detect a synthetic stone in a gem lab. 


Are Laboratory grown diamonds real?

Yes! Laboratory grown diamonds are just grown in a different environment to natural diamonds but in exactly the same conditions! They have the same properties, characteristics and crystal structure as natural diamonds including the 4 C's (cut, clarity, carat and colour) and are a 10 on the hardness scale.

How much cheaper are lab grown diamonds?

Currently they are 30-50% cheaper than natural diamonds. However this may change the easier and quicker they are to produce!

How do I care for my lab-grown diamond jewellery?

The exact same way you would care for a natural diamond. Take your piece to a local jewellers and ask for the setting and stone to be professionally checked. To remove any dirt and oils place your piece in warm soapy water and use a soft old toothbrush to clean. 

Should a lab-grown diamond be certified?