Synthetic emerald has always been of considerable interest as a gem material. Recent work in solid state physics indicates that beryl containing chromium (and other transition metal ions) is also of research interest and may be of value for certain electronic applications (Geusic et al., 1959; Gerritsen, 1962). While emerald has previously been synthesized, by growth from flux systems (Hautefeuille and Perrez, 1888; Dana, 1949; Smith, 1958; and Alexander, 1949) and hydrothermally (Van Praagh, 1947), the procedures employed are inconvenient and/or result in relatively small crystals. Furthermore, successful deposition of singlecrystal emerald on seeds using these methods has not been reported. Emerald crystals sufficiently large for gem fabrication have been grown (Smith, 1958), but commercial value of the resulting product has prevented the pertinent data from reaching either the scientific or the patent literature. The purpose of this note is to describe a flux system that shows considerable promise for the synthesis of large emerald crystals.

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