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Chelsea Filter

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Summary The original Chelsea Filter, as developed at the Chelsea College of Science and Technology in 1934.  Do not confuse this with the many copies. Detail Many stones appear to change colour when viewed through the filter. Originally designed for detecting synthetic emeralds, nowadays the Chelsea filter is an invaluable aid to identifying many other gemstones. It can give an indication that you have an emeralds and aquamarines, though not a guarantee, since there is considerable variation in their chemical compositions (e.g. the amount of chromium that gives the green colour and the amount of iron that 'dampens' the effect through the filter). It gives a very clear and spectacular result on blue stones coloured with cobalt. Since cobalt doesn't colour stones blue in nature, this is a sure-sign that you have a manmade stone (e.g. synthetic spinel) or glass. With skill, it helps identify dozens of other stones. It's particularly useful when you have to sort large parcels of stones into 'probables' - then you have clues as to which tests to carry out next.  Is it easy to use? USING it is very easy indeed. Shine a light (e.g. our pen-torch) on the stone, hold the filter close to your eye, view any colour change. You don't even have to hold the stone close to the filter (only the filter has to be close to your eye) so you can examine stones in museum showcases.  Instructions are included. Limitations & Disclaimer There is an instruction sheet supplied with the filter. However, in common with all gem testers, it does not provide an instant, easy and guaranteed identification of gemstones (the only 'easy' one is detecting cobalt-blue stones, which will be synthetic…or glass).  All equipment and materials must be used in conjunction with the user's skill, knowledge and experience. Under no circumstances shall QUICKTEST be liable for direct or indirect loss sustained in connection with any item. It is your responsibility to regularly check equipment against known samples, to ensure that it is working correctly.

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Displaying all 6 reviews
AS
Allan Sholem
2 years ago
Date of purchase: 16/10/2021
Chelsea Filter
great service*****great service*****
Trusted Customer
2 years ago
Date of purchase: 28/06/2021
Chelsea Filter
I am teaching my grand-daughter gemmology lessons and this is a simple teaching aid to introduce her to identifying gems, especially synthetic ones. It is fun to see certain stones change colour unde
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Trusted Customer
8 years ago
Date of purchase: 12/03/2016
Chelsea Filter
Trusted Customer
10 years ago
Date of purchase: 04/02/2014
Chelsea Filter
and as usual
Trusted Customer
11 years ago
Date of purchase: 28/05/2013
Chelsea Filter
Trusted Customer
11 years ago
Date of purchase: 10/12/2012
Chelsea Filter
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Unit 7, Park House,, 15-19 Greenhill Crescent, WATFORD, WD18 8PH, United Kingdom
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