Chelsea Filter Magnifier Style_Accessory See a guide to magnifiers

See a guide to magnifiers for the partially-sighted

Takes one 9v PP3 battery (supplied)

For measuring specific gravity

Weight including battery: 230g

Chelsea Filter Magnifier Style_Accessory See a guide to magnifiersSummary 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