The Journal of Gemmology
Volume 22 No. 6. April 1991 The Journal of Gemmology THE GEMMOLOGICAL ASSOCIATION AND GEM TESTING LABORATORY OF GREAT BRITAIN OFFICERS AND COUNCIL Past Presidents: Sir Henry Miers, MA, D.Sc, FRS Sir William Bragg, OM, KBE, FRS Dr. G.E Herbert Smith, CBE, MA, D.Sc. Sir Lawrence Bragg, CH, OBE, MC, B.Sc, FRS Sir Frank Claringbull, Ph.D., Elnst.E, FGS Vice-President: R. K. Mitchell, FGA Council of Management D.J. Callaghan, FGA N.WDeeks,FGA N.B. Israel, FGA E.A. Jobbins, B.Sc, C.Eng., FIMM, FGA I. Thomson, FGA V.E Watson, FGA K. Scarratt, FGA : Chief Executive R.R. Harding, B.Sc, D.Phil., FGA : Director of Gemmology Members' Council A. J.Allnutt,M.Sc, D. Inkersole, FGA PG. Read, C.Eng., Ph.D., FGA B. Jackson, FGA MIEE, MIERE, FGA C. R. Cavey, FGA G.H. Jones, B.Sc, Ph.D., FGA I. Roberts, FGA R J. E.Daly, B.Sc, FGA H. Levy, M.Sc,BA, FGA E.A. Thomson, T. Davidson, FGA J. Kessler Hon. FGA R. Fuller, FGA G. Monnickendam R. Velden J.A.W Hodgkinson, L. Music D. Warren FGA J.B. Nelson, Ph.D., FRMS, CH. Winter, FGA FInst.P, FGA Branch Chairmen: Midlands Branch: D.M. Larcher, FBHI, FGA North-West Branch: W Franks, FGA Examiners: A. J. Allnutt, M.Sc, Ph.D., FGA D. G. Kent, FGA E. M. Bruton, FGA P Sadler, B.Sc, FGS, FGA C. R. Cavey, FGA K. Scarratt, FGA A. E. Farn, FGA E. Stern, FGA R. R. Harding, B.Sc, D.Phil., FGA M.
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