Synthetic diamonds were a rare encounter in the gem market until a few years ago. 1 – A colorless HPHT synthetic diamond (left) and an as-grown (= untreated) vivid yellow HPHT synthetic diamond (right) under deep UV excitation of the GGTL Mega-DFI System, showing characteristic luminescence that visualizes the characteristic growth sectors of the diamonds. This article gives an overview of the current market situation and the identification methods and technologies, in which luminescence based testing plays a significant role (Fig. Until then, lab grown diamonds have been a very minor issue in the market for the first 60 years after their first successful growth in 1953 by Asea in Sweden (monocrystalline HPHT synthetic diamond) and 1952 by the Union Carbide Corporation in the USA (polycrystalline CVD synthetic diamond). Synthetic diamonds have made a quantum leap in the market since 2015.
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