[GEMMOLOGY] SINKANKAS, John. Gem Cutting. A Lapidary's Manual, New York: Van Nostrand Reinhold, [1962], 4to, second edition, coloured frontispiece, illustrations, original cloth, dust-jacket. [Sinkankas 6086] - Peter G. READ. Gemmological Instruments, their use and principles of operation, London: Newnes-Butterworths, [1978], 8vo, FIRST EDITION, illustrations, original boards, dust-jacket. [Sinkankas 5387] - George G. BLAKEY. The Diamond, New York: Paddington Press, [1977], 4to, illustrations, some coloured, original cloth, dust-jacket. [Sinkanas 686]. With 43 other books on gemmology. (46)