Webster, Robert.
Gems : their sources, descriptions and indentification / Robert Webster. - 4th ed. / - London : Butterworths, 1983. - xxii, 1006 p. : ill. (some col.).
0408011483
Precious stones.
Gems.
Gems : their sources, descriptions and indentification / Robert Webster. - 4th ed. / - London : Butterworths, 1983. - xxii, 1006 p. : ill. (some col.).
0408011483
Precious stones.
Gems.