Chelsea Filter Magnifier Style_Accessory Standard Presidium (GEMTEST-P2)

Standard Presidium (GEMTEST-P2)

Takes one 9v PP3 battery (supplied)

and through the viewfinder you see a scale

Lightweight and comfortably handheld (see pictures)

Chelsea Filter Magnifier Style_Accessory Standard Presidium (GEMTEST-P2)Summary The original Chelsea Filter, as developed at the Chelsea College of Science and Technology in 1934. Do not confuse this with the many copies. Detail Many stones appear to change colour when viewed through the filter. Originally designed for detecting synthetic emeralds, nowadays the Chelsea filter is an invaluable aid to identifying many other gemstones. It can give an indication that you have an emeralds and aquamarines, though not a