Chelsea Filter Magnifier Style_Accessory For measuring specific gravity

For measuring specific gravity

For the non-expert: if you can see inclusions (e

Weight including battery: 230g

The battery icon on the display means low battery

Standard Presidium (GEMTEST-P2)

Chelsea Filter Magnifier Style_Accessory For measuring specific gravitySummary 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