Chelsea Filter Gemological Tools gemstone Identifier

Chelsea Color Filter for Gemstone

CHELSEA FILTERS It is an essential device in identifying colored stones. While it was originally intended to rapidly differentiate between genuine Emeralds and the pastes and doublets which resemble them it also is a valuable aid in identifying other colored stones as well. Designed to transmit only deep red and yellow-green light and the best results are obtained when stones are examined under a strong electric light.