Are there color grades for lab-grown diamonds? Will lab-grown diamonds turn yellow?

Are there color grades for lab-grown diamonds? Will lab-grown diamonds turn yellow?

1. Are there color grades for lab-grown diamonds?

The most common color of lab-grown diamonds is colorless and transparent. However, if you look carefully, some lab-grown diamonds are actually slightly yellowish in color. Therefore, the Gemological Institute of America (GIA) classifies the colors of lab-grown diamonds based on the amount of yellow elements they contain. , from high to low: D, E, F, G, H, I, J, K, M, N.

D grade: D grade lab-grown diamonds are completely colorless and are the highest grade among diamond grades. However, diamonds of this grade are very rare, so the price is also very high.

E grade: Colorless grade. Consumers cannot see the difference at all if they see it with the naked eye. Only professional gem appraisers with the help of special machines can distinguish the cool elements contained in cultivated diamonds, so it is also very rare.

F grade: It also belongs to the colorless grade. Jewelry appraisers can see almost no yellow elements, so it is also a higher quality cultivated diamond.

G-H grade: Close to colorless grade. The difference can only be seen by comparing it with high-quality diamonds, so the quality of G-H grade cultivated diamonds is still very high.

Level I-J: A small amount of yellow elements can be seen with the naked eye.

K-N grade: The yellow element of cultivated diamonds can be observed with the naked eye. It has no investment value and is not recommended to be purchased.

2. Will lab-grown diamonds turn yellow?

Lab-grown diamonds will not yellow.

The color of artificially grown diamonds is affected by whether impurities are mixed during the synthesis process, or whether defects occur during the deposition process. The structure of cultured diamonds at room temperature is usually very stable and will not change over time.

However, white lab-grown diamonds may turn yellow as they are worn. This is because they are lipophilic. This is mainly due to oil, dust, etc. being stuck on the surface of lab-grown diamonds, so they look dull and yellow. This is not a lab-grown diamond. itself turns yellow. If the surface turns yellow, it can be restored after cleaning.