Lab-grown diamonds are created by mimicking the natural conditions under which diamonds form in the Earth's mantle.
There are two primary methods used to manufacture lab-grown diamonds: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD).
How do you manufacture lab-grown diamonds? – 4 Key Methods Explained
1. High Pressure High Temperature (HPHT) Method
This method involves using a large machine to subject carbon material to extreme pressures and temperatures.
The machine crushes the carbon under pressures exceeding 870,000 lbs. per square inch and at temperatures ranging from 1300 to 1600 degrees Celsius.
This process mimics the natural geological conditions where diamonds are formed, allowing the carbon to crystallize into diamond.
2. Chemical Vapor Deposition (CVD) Method
In the CVD method, a small diamond seed is placed in a chamber and exposed to a carbon-rich gas, typically methane.
The gas is ionized using microwaves or lasers, heating it to very high temperatures.
The carbon atoms in the gas break away from the methane molecules and deposit onto the diamond seed, bonding to it and growing the diamond layer by layer.
This process takes place over several weeks, resulting in a fully formed diamond.
3. Chemical and Physical Identicality
Both HPHT and CVD methods produce diamonds that are chemically and physically identical to natural diamonds.
They are composed of pure carbon crystallized in an isotropic 3D form, sharing the same properties as their natural counterparts.
4. Controlled Environment and Time
These lab-grown diamonds are created in a controlled environment, taking only six to eight weeks to form.
This is in stark contrast to the billions of years it takes for natural diamonds to form under Earth's surface.
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