Practical gemmology : a study of the identification of gem-stones, pearls, and ornamental minerals /
Webster, Robert.
Practical gemmology : a study of the identification of gem-stones, pearls, and ornamental minerals / by Robert Webster. - 5th ed. - London : N.A.G. Press, 1973. - 209 p., [4] p. de lám. : il. ; 19 cm.
Índice.
Piedras preciosas.
Gemas.
671.15 549.091
Practical gemmology : a study of the identification of gem-stones, pearls, and ornamental minerals / by Robert Webster. - 5th ed. - London : N.A.G. Press, 1973. - 209 p., [4] p. de lám. : il. ; 19 cm.
Índice.
Piedras preciosas.
Gemas.
671.15 549.091
