Gem Identification Using Magnetism

Robert James
Robert James
44.4 هزار بار بازدید - 12 سال پیش - The International School of Gemology
The International School of Gemology presents a new concept in the identification of gemstone through the use of industrial magnets to attract gemstones containing iron. This is a graphic demonstration of how the concept does work, and at least one current application.
12 سال پیش در تاریخ 1391/08/17 منتشر شده است.
44,436 بـار بازدید شده
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