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Your cart is empty.This gemological tool is helpful for identifying certain red, blue and green gemstones. It is used to determine whether a gemstone is natural or synthetic and can also be used for detecting Synthetic Blue Spinel as well as for detecting dyes in certain gemstones. The Chelsea Filter is a popular Gemological Dichromatic Filter that was originally devised by Anderson and Payne in 1934 at the Gem Testing Laboratory of the London Chamber of Commerce. The filter was devised with the collaboration of gemology students of the Chelsea College of Science and Technology. As this filter allowed transmission of both deep red wavelengths around 690 nm and yellow-green wavelengths, around 570 nm, that matched an Emerald's emission and absorption characteristics, it was initially recommended to assist the discrimination between natural emerald and its simulants such as Green Glass, Tourmaline, Peridot, etc. This discrimination was possible because Chromium - containing Iron - and Vanadium-Free Emeralds emitted a red fluorescence when illuminated by white light that had a content of ultraviolet wavelengths.
Satisfied Byer
2025-09-05 13:38:55
I don't see why anyone would pay double the price. This one works great and the leather case is fantastic for protecting it as I travel with it.
Bobbie Henderson
2025-08-28 12:47:56
this works
oceanpixie
2025-06-21 21:31:55
Works exactly as it should. I'm a GIA gemologist and bought this to use while completing my Gem ID class. 500 gemstones analyzed and this is great for questionable green & blue gems. It will show blue gems that are dyed, resulting in a red/pink color under the filter. Green gems colored by chromium (emeralds), will show pink. Tough for dyed jadeite, as some green dyes will not show red & remain green under the filter. Magnification and spectrum are really the key to identifying jadeite.
Julie Doherty
2025-06-05 15:42:44
I have been looking at some of my gemstones to verify that they are real and not fake stones and am amazed at the clarity
Dennis
2025-04-11 14:18:04
OK to use. It's just a filter.
mybestbuys
2025-03-13 19:00:14
This is a great price for this item, but it didn't come with any instructions. Without instructions you will have to Google how to use this. Once I figured out how to use it I didn't have any problems, works great!!
dkm7191
2025-02-22 17:55:45
Wonderful little simple instrument that I use primarily to determine if green jadeite is dyed or not. Good product. Thank you.
Clement Wuthrich
2025-02-13 13:48:19
good quality, do the job!!
RIGHT
2025-01-07 18:32:22
OK
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