gems testing (4 resultados)

Condición: Very Good. Very Good condition. Good dust jacket. 3rd printing, 1979. (precious stones, identification, field guides) A copy that may have a few cosmetic defects. May also contain a few markings such as an owner's name, short gifter's inscription or light stamp.

paperback. Condición: New. Language:Chinese.Publisher: China University of Geosciences Press Pub. Date :2004-01. Gemmology Foundation Course is to prepare for the British Association of gem stones Foundation Studies examinations offered a separate course. Foundation Studies stones main purpose is to: (1) enables you to understand the principles of gemology; (2) gemological knowledge to make you lay a good foundation in and familiar with many important gem; (3) so that you can learn for effective observation and testing.

paperback. Condición: New. Language:Chinese.Publisher: China University of Geosciences Press Pub. Date :2004-01. Gemmology Foundation Course is to prepare for the British Association of gem stones Foundation Studies examinations offered a separate course. Foundation Studies stones main purpose is to: (1) enables you to understand the principles of gemology; (2) gemological knowledge to make you lay a good foundation in and familiar with many important gem; (3) so that you can learn for effective observation and testing.

paperback. Condición: New. Paperback. Pub Date: 2018-08-01 Pages: 191 Language: Chinese Publisher: Shanghai People's Fine Arts Publishing House Basic Jade Testing Basics and Applied Jewellery Professional Skills Series is based on the precious gemstone teaching and gemological research accumulated by the author for many years Experience. based on the new national standard of jewelry and jade. widely refer to international mainstream gems .