218. Schumann, Walter. Gemstones of the World. New York: Sterling Publishing Company Ltd., 1977.


218. Schumann, Walter. Gemstones of the World. New York: Sterling Publishing Company Ltd., 1977.
218. Schumann, Walter. Gemstones of the World. New York: Sterling Publishing Company Ltd., 1977.
218. Schumann, Walter. Gemstones of the World. New York: Sterling Publishing Company Ltd., 1977.
218. Schumann, Walter. Gemstones of the World. New York: Sterling Publishing Company Ltd., 1977.
218. Schumann, Walter. Gemstones of the World. New York: Sterling Publishing Company Ltd., 1977.
218. Schumann, Walter. Gemstones of the World. New York: Sterling Publishing Company Ltd., 1977.