Lot of 9 works of gemmology including: - Brazil. Paradise of Gemstones, Jules Roger SAUER, 1982 - From precious stones to fine stones. Guide of the amateur and the collector, Claire and Alain da Cunha, Librairire Plon 1984 - Gemstone Identification, B.W. Anderson, Editions Hugo Buchser S.A., Geneva, 1975 - Handbook of Gem Identification, Richard T. Liddicoat, Jr, Gemmological Institute of America, 1981 - THE PEARL and its secrets, Jean TABURIAUX, 1983 - The COLLECTOR/INVESTOR of GEMS, John L. Ramsey and Laura J. Ramsey, Boa Vista Press, 1985 - Guide to precious, fine and ornamental stones, Walter SCHUMANN, DELACHAUX ET NIESTLE, 1976 - GEMSTONES of the WORLD, Walter SCHUMANN, N.A.G. Press, 1977 - Introduction to gemmology, Hubert Lagache, 1979