What are the advantages of CVD grown diamonds compared to HPHT grown diamonds?

1. The color of CVD grown diamonds can be changed

The color of natural diamonds can also change due to other elements added during the growth process, and some are caused by defects in the crystal structure. For example, yellow diamonds may change color due to the influence of nitrogen during growth, blue may change color due to boron, and green may result from radiation causing carbon atoms in the crystal structure to deviate from their normal positions.

CVD diamonds can change the color of the stone by adding color-producing elements to hydrocarbon gases during the growth process of its seed disc. Currently, large carat pink, blue, and yellow diamonds are available, and some are of very good color. Even GIA calls it Fancy Intense or Fancy in its report.

2. The biggest advantage of CVD grown diamonds is that they are purer inside.

We have introduced the manufacturing method of CVD diamonds before. Since the growth environment of CVD diamonds has a higher gas content than HPHT diamonds containing metal co-solvents, the biggest advantage of CVD diamonds is that they are very pure inside. The clarity is generally vvs1-si1, and most can reach VS2 or above.

Diamonds are composed of different elements. Diamonds can be divided into four types according to their composition, namely Type IaA (containing nitrogen in the atomic structure), Type Ib (containing irregularly arranged nitrogen), and Type IIa (pure carbon). ), Type IIb (contains boron, the common cause of color in blue diamonds).