When selecting a diamond, whether lab-grown or mined, understanding the grading system is crucial. Both types of diamonds are evaluated using the same industry-standard chart developed by the International Gemological Institute (IGI) and other top gemological labs. This grading system provides buyers with insight into the 4Cs: Carat, Cut, Color, and Clarity—the key factors that determine a diamond’s beauty and value.

 

The 4Cs of Diamond Grading

 

1. Carat: Measures the weight of the diamond. Larger diamonds generally have higher carat weights and value, but cut and shape also affect their visual size.

2. Cut: Refers to how well a diamond’s facets are proportioned and polished to reflect light. A well-cut diamond maximizes brilliance and sparkle.

3. Color: Graded from D (colorless) to Z (light yellow or brown), with diamonds closer to D being the most valuable. Lab-grown diamonds are graded on the same scale as mined diamonds.

4. Clarity: Assesses the presence of natural inclusions and blemishes. The IGI chart ranges from Flawless (FL) to Included (I1-I3), with higher clarity diamonds being more valuable.

 

The IGI Grading Chart

 

Both lab-grown and mined diamonds are graded using the same IGI chart, ensuring a fair comparison. This consistency reflects the fact that lab-grown diamonds are identical in chemical and physical properties to mined diamonds. A diamond’s grading certificate, which includes a detailed breakdown of the 4Cs, ensures transparency and gives you confidence in your purchase, regardless of the diamond’s origin.

 

When browsing for a diamond, look for the IGI grading certificate to confirm its quality. This chart helps you compare diamonds side-by-side, ensuring you choose the one that perfectly matches your preferences and budget.