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https://www.amazon.com/Chelsea-Dichroscope-Jewelers-Gemological-Refractometer/dp/B001EBEEBU
Chelsea Filter - now used to identify mostly any gemstone Dichroscope - invaluable for distinguishing certain stones from similar gems. 10x triplet jewellers loupe in black …4.2/5(33)
https://www.amazon.com/Chelsea-Filter-Dichroscope-Jewelers-Loupe/dp/B001D0B5XW
Originally used to differentiate genuine emeralds from other similarly colored stones such as tourmaline and peridot, the Chelsea filter is now used, often in conjunction with …Reviews: 11
https://www.gemporia.com/en-us/learning-library/other/chelsea%20filter/
First developed in 1930 by two teachers at the Chelsea College of Science in London, the Chelsea Filter is the most commonly used filter in the gem industry. Also known as the Emerald Filter, its use originally was to detect Emeralds from other gemstones such as Green Sapphires and Tourmalines, as well as man made simulants such as glass.4.8/5
https://gemologyonline.com/chelsea_filter.html
Chelsea Filters are simply dichromatic filters developed in 1934, not originally intended to be used for gemological purposes. The filter is only able to transmit light in 2 regions of the spectrum: deep red (690nm) and near yellow-green (570nm).
https://www.alibaba.com/showroom/chelsea-filter.html
Foldable Chelsea Jadelite Filter for Gem Emerald 20mm diameter Identification tools for Gemstone (OEM Packaging Available)
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