Grading Lab-Grown Diamonds: GIA vs. IGI — A Research Overview
1. Background: Lab-Grown Diamond Certification Lab-grown diamonds (LGDs) are chemically and physically the same as natural diamonds but are created in controlled laboratory environments using methods like High Pressure High Temperature (HPHT) or Chemical Vapor Deposition (CVD). As production of LGDs has surged over the last decade, certification labs have adapted their approaches to grading and reporting these stones. A key part of this ecosystem is independent third-party certification, which aims to provide objective information on a diamond’s quality characteristics. Two of the most recognized gemological laboratories are: The...
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