demonstrated its ability to grow single-crystal CVD synthetic diamonds of moderate gem quality several years ago (Wang et al., 2003). For the most part, the samples examined in 2003 were relatively small and of limited thickness for faceting purposes. Nearly all of these early crystals were predominantly brown with varying degrees of saturation. Colorless CVD-grown diamonds, both nitrogen doped and high purity, were also synthesized by LIMHP-CNRS in France (Achard et al., 2005;Wang et al., 2005), but the reported crystals were usually

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