Conclave 2026

Production of laboratory-grown diamonds (LGD) for jewelry is constantly evolving, introducing new advancements that occasionally alter the properties of these stones. These changes raise the risk of misidentification by trade members using shelf product screening devices (also known as Diamond Verification Instruments), which could lead to reputational damage and loss of trust. This presentation provides a detailed review of the latest screening models and technologies for distinguishing natural diamonds from LGDs. Each method and its features are explored, along with limitations and blind spots identified by Stuller’s research on 20 million screening tests. Additionally, new advancements in HPHT and CVD melee LGDs, and the challenges to current screening methods, will be discussed.