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Gem­stones by Ed­ward Gube­lin Gems: Their Sources, De­scrip­tions and Iden­ti­fi­ca­tion by Robert Web­ster In­Color mag­a­zine by ICA Ruby & Sap­phire by Richard W. Hughes Gems & Gem­mol­ogy by GIA www.Ruby-Sap­ In­ter­nal World of Gem­stones by Ed­ward Gube­lin Pho­toat­las by E.J. Gube­lin & J.I. Koivula Gem­stone Prop­er­ties by K.T. Ram­chan­dran & J. Pan­jikar R&D Depart­ment, Gem­mo­log­i­cal In­sti­tute of In­dia

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