Gemmologf^ The Journal of \ y Volume 26 No. 6 April 1999 II J The Gemmological Association and Gem Testing Laboratory of Great Britain Gemmological Association and Gem Testing Laboratory of Great Britain 27 Greville Street, London EC1N 8TN Tel: 0171 404 3334 Fax: 0171 404 8843 e-mail:
[email protected] Website: www.gagtl.ac.uk/gagtl President: Professor R.A. Howie Vice-Presidents: E.M. Bruton, A.E. Farn, D.G. Kent, R.K. Mitchell Honorary Fellows: R.A. Howie, R.T. Liddicoat Jnr, K. Nassau Honorary Life Members: D.J. Callaghan, E.A. Jobbins, H. Tillander Council of Management: T.J. Davidson, N.W. Deeks, R.R. Harding, MJ. O'Donoghue, I. Thomson, V.R Watson Members' Council: A.J. Allnutt, P. Dwyer-Hickey, S.A. Everitt, A.G. Good, J. Greatwood, B. Jackson, J. Kessler, J. Monnickendam, L. Music, J.B. Nelson, P.G. Read, R. Shepherd, P.J. Wates, C.H. Winter Branch Chairmen: Midlands - G.M. Green, North West - L Knight, Scottish - B. Jackson Examiners: A.J. Allnutt, M.Sc, Ph.D., FGA, L. Bartlett, B.Sc, M.Phil., FGA, DGA, E.M. Bruton, FGA, DGA, S. Coelho, B.Sc, FGA, DGA, Prof. A.T. Collins, B.Sc, Ph.D, A.G. Good, FGA, DGA, J. Greatwood, FGA, G.M. Howe, FGA, DGA, G.H. Jones, B.Sc, Ph.D., FGA, M. Newton, B.Sc, D.Phil, C.J.E. Oldershaw, B.Sc (Hons), FGA, H.L. Plumb, B.Sc, FGA, DGA, R.D. ROSS, B.Sc, FGA, DGA, PA. Sadler, B.Sc, FGA, DGA, E.