Lab-grown diamonds, also known as synthetic or man-made diamonds, undergo a grading process similar to that of natural diamonds. This grading assesses the same fundamental attributes—cut, color, clarity, and carat weight—but there are specific considerations and nuances related to their synthetic origin. Here's a detailed look at the grading process for lab-grown diamonds.

Carat weight is measured to the same precision as natural diamonds, with 1 carat equal to 200 milligrams. Lab-grown diamonds are often available in larger sizes at a lower cost compared to their natural counterparts.

The cut of a lab-grown diamond is evaluated based on how well the diamond's facets interact with light, influencing its brilliance, fire, and scintillation. The grading scale ranges from Excellent to Poor, similar to natural diamonds. Precision in cutting is critical to maximize the diamond's optical performance.

Lab-grown diamonds are graded on the same color scale as natural diamonds, ranging from D (colorless) to Z (light yellow or brown). Some lab-grown diamonds can exhibit unique color hues or undertones due to the manufacturing process. High-purity nitrogen-free environments typically produce the highest color grades.

Clarity grading examines internal and external imperfections. Lab-grown diamonds can have different types of inclusions compared to natural diamonds, such as metallic inclusions from the growth process. The scale ranges from Flawless (FL) to Included (I1, I2, I3), with gradations in between (e.g., VVS, VS, SI).