... genuine stone (pastes, doublets, soude Emeralds) retain a green appearance. Chelsea is definitely a helpful tool in identifying certain red, blue ... aquamarine and sapphires appear green or green-grey. With a Chelsea filter, a dichroscope, a spectroscope, and a 10x loupe, ... identify over 85% of the gemstones out there.With Chelsea filters you can differentiate the genuine emeralds from the fake ...