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This listing is for 1 Chelsea/Jadeite filter and 1 Ruby filter. 2 most popular and commonly used gem filters.
1.Ruby Filter : It is a small device that you look through to aid in the identification of gemstones, in particular to spot real rubies amongst gemstones that are not rubies, or vice versa.
Below are the appearance of various red and pink gemstones when a Ruby Filter is in use:
Type of Stone or Gemstone Colour Shown through Filter *Red Beryl *Grey *Almandine Garnet *Gray *Pyrope Garnet *Brownish *Rhodolite Garnet *Gray *Red Glass *Dark Purple *Ruby *Bright Blue *Pink Sapphire *Light Blue *Spinel *Gray/Blue *Pink Spinel *Light Blue *Tourmaline *Gray/Purple 2.Chelsea Filter : 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. Just hold the filter close to the eye with the stone or stones (for a number of stones can be examined at one time) receiving as much light as possible. Under these conditions, Emeralds (absorbing in the yellow green) usually appear distinctly red or pinkish in colour, the actual tint varying from merely pinkish in the case of pale stones, to a rich almost ruby red for better coloured specimens. On the other hand, most imitations of the genuine stone (pastes, doublets, soude Emeralds) retain a green appearance. A helpful tool in identifying certain red, blue and green stones.
Below are the appearance of various red and pink gemstones when a Chelsea Filter is in use: Type of Stone Colour Shown through Filter Aquamarine Green Cobalt Glass Deep Red Emerald - Natural Pinky Red Emerald - Synthetic Deep Red Emerald - Simulants Green Garnet - Demantoid Red (but with negative refractometer reading due to no internal reflection) Jade - Majority of Treated Reddish |
