Types of Lab Grown Diamonds
Lab diamonds start as tiny carbon seeds from pre-existing diamonds. There are two primary techniques used to create lab diamonds: High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD).
- HPHT Lab Diamonds: This method mimics the natural conditions under which diamonds form inside the Earth. A diamond seed is placed in a chamber and subjected to intense heat (over 2,000 degrees Celsius) and pressure (1.5 million pounds per square inch). The carbon atoms in the chamber bond with the seed, crystallizing into a diamond.
- CVD Lab Diamonds: This method starts with a thin piece of diamond seed being placed in a vacuum chamber filled with a carbon-rich gas mixture (typically methane and hydrogen) that’s heated to break down the gas molecules. Carbon atoms settle onto the seed, building layer by layer until the diamond reaches its desired size. Some CVD diamonds undergo additional pressure and heat treatment after growth.
Both methods simulate part of the natural diamond-forming process, resulting in high-quality diamonds that are identical to mined diamonds in every way. After several days, a rough diamond is created, then cut, polished, and set in jewelry. Both methods yield real diamonds with no differences in durability or quality, differing only in growth patterns and production time.
With the naked eye, it’s impossible to differentiate between natural diamonds, HPHT lab diamonds, and CVD lab diamonds; only experts can identify subtle markers related to growth patterns.