High Pressure High Temperature Method (HPHT)

Diamond is the most solid stone in the world, so powerful that it can make all women drooling over its amazing rays of light no other gem can boast to produce. With such high parameters as diamond has, growing it in the laboratory conditions could be something of a challenge. But thanks to qualified specialists and scientists man made diamonds are no longer a dream!

However, as it often happens new ideas have to go through praise and criticism. It’s no surprise, it took time for laboratory grown diamonds to win their place on a jewelry market, but today they are getting more popular among diamond buffs around the world. No wonder, people show more interest in grown diamonds due to may reasons including lower price, eco-friendliness, high quality, durability and others. But alongside all above mentioned the customers are also prone to know more about the technology used to cultivated these gems and at the same time to endow them with all the properties of mined diamonds. Our aim is to avail you with a source of information concerning how diamonds are made by man.

Let’s focus on one of the methods used to cultivate diamonds: high pressure high temperature (hpht) method, the one used by such known diamond creating laboratories as New Age Diamonds, Gemesis, Chatham and D.Nea.

The method itself was developed in the middle of 1950s and has since been modified by various research laboratories specializing in diamond synthesis around the world. The highest quality lab-made diamonds are grown using variants of this method; the most successful involves growing the diamonds in a ‘flux’ of molten metal alloy.

HPHT method recreates the actual geological conditions that occur 150 km deep in the Earth’s mantle. The conditions are a unique and powerful combination of extreme pressure (up to 60,000 atmospheres) and very high temperature (up to 2,500°C), which are the natural conditions for diamond formation.

The equipment itself is known as ‘split sphere’ technology or ‘BARS’. The machinery utilizes a built-in growth cell where the carbon seed of a crystal is placed and where extreme pressures and temperatures are applied. The atoms of carbon are transformed and grow into what is known as the hardest and most perfect substance found in Nature – the Diamond.


This information is taken from http://www.newagediamonds.com/education/hpht.html

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