Gem Identification Using Magnetism
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