The Journal of Gemmology Volume 26 No. 2 April 1998 The Gemmological Association and Gem Testing Laboratory of Great Britain Gemmological Association and Gem Testing Laboratory of Great Britain 27 Greville Street, London EC1N 8SU Tel: 01714043334 Fax: 01714048843 e-mail:
[email protected] Website: www.gagtl.ac.uk/gagtl President: Professor RA Howie Vice-Presidents: E.M. Bruton, AE. Faro, D.G. Kent, RK. Mitchell Honorary Fellows: RA Howie, R.T. Liddicoat Jill, K. Nassau Honorary Life Members: D.J. Callaghan, E.A Jobbins, H. Tillander Council of Management: CR Cavey, T.J. Davidson, N.W.. Deeks, RR Harding, I. Thomson, V.P. Watson Members' Council: AJ. Allnutt, P. Dwyer-Hickey, R Fuller, J. Greatwood, B. Jackson, J. Kessler, J. Monhickendam, 1. Music, J.B. Nelson, P.G. Read, R Shepherd, CH. Winter Branch Chairmen: Midlands ~ G.M. Green, North West -I. Knight, Scottish - B. Jackson Examiners: AJ. Allnutt, M.5c., Ph.D., FGA, S.M. Anderson, B.Sc. (Hons), FGA, 1. Bartlett, B.Sc., M.Pbil., FGA, DGA, E.M. Bruton, FGA, DGA, CR Cavey, .FGA, S. Coelho, B.Sc., FGA, DGA, Prof. AT. Collins, B.Sc., Ph.D, AG. Good, FGA, DGA, CJ.E. Hall, B.Sc. (Hons), FGA, G.M .. Howe, FGA, DGA, G.H. Jones, B.5c., Ph.D., FGA, M. Newton, B.Sc., D.Phil.,H.1. Plumb, B.Sc., FGA, DGA, RD. Ross, B.Sc., FGA, DCA, P.A Sadler, B.5c., FCA, DCA, E. Stern, FGA, DGA, P rof. I. Sunagawa, D.5c., M. Tilley, GG, FGA, CM. Woodward, B.Sc .., FGA, DGA The Journal of Gemmology Editor: Dr RR Harding Assistant Editors: M.J.