Lab-grown diamonds are becoming increasingly popular due to their ethical and cost-effective nature. However, there are two main methods used to grow these diamonds: Chemical Vapor Deposition (CVD) and High Pressure High Temperature (HPHT). Understanding the differences between these methods can help you make an informed decision.
4 Key Differences Between CVD and HPHT Lab-Grown Diamonds
1. Growth Patterns and Morphology
CVD diamonds grow in a single direction. This results in a cubic shape.
HPHT diamonds grow in 14 different directions. This results in a cuboctahedron shape.
These distinct growth patterns can be used to differentiate between the two types of lab-grown diamonds. However, it typically requires a trained expert to discern these differences.
2. Process Differences
The HPHT process mimics the natural diamond-making process. It subjects carbon to high levels of pressure and temperature, similar to conditions within the Earth. This method can produce high-quality diamonds with minimal post-growth treatment.
The CVD process uses Chemical Vapor Deposition. A hydrocarbon gas mixture is broken down to deposit carbon onto a substrate in a vacuum chamber. This process requires lower temperatures and pressures, making it less energy-intensive and potentially more cost-effective.
3. Quality and Inclusions
Experts generally find that HPHT diamonds are created to a better quality than CVD diamonds. HPHT diamonds have fewer inclusions and less frequent need for post-growth treatment.
However, CVD diamonds can be grown over larger areas. They also allow for finer control over the environment in the growth chamber, resulting in more consistent properties in the finished diamonds.
4. Distinguishing Between CVD and HPHT Diamonds
The key difference between an HPHT diamond and a CVD diamond lies in their crystal structures and growth patterns. A lab diamond expert may be able to tell the difference between the two by examining the crystal structure under magnification.
While CVD diamonds may occasionally show evidence of strains, this is rare and only visible under extremely high magnification.
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