Using a Chelsea Colour filter to test gemstones not just Emeralds 

Fascinating history of emeralds.

Another most excellent video! So far you create the best videos for gem education that I have seen on RU-vid so far. Thank you!

I have just been taken to school, with this video, and I love it ! Many thanks !!

Yep, im a GIA Gemmologist, and the GIA, only reconize like an emerald, if have saturation of crome. If the emerald is of VANADIUM they put a note in the certificate, like a vanadium green beryl. The so-called "zambian emeralds", in fact are not emeralds, because have re-constituited treatment, and GIA does not call gem, a re-.constituited gemstone. Too in the case of the "Glass filled ruby" in fact, are not ruby, because are reconstituited, and loose the gem value. Great speech friend!!! im understand u at the perfection.

You mentioned white light, but, i saw a warm color light. Also, i used the sun's light against an emerald and it showed a red color. I used the same emerald with an LED white light and it came out as green/yellow...

Interesting information about Chelsea color filter. Thank you!!

Great video. A chelsea filter demo and a history of Emerald controvesy, catching even a newbie like me up to speed in 10 minutes! Thank you! One question for you; I have heard that there is in addition to a Chelsea filter, a filter made primarily for Ruby and that it turns red ruby blue when being viewed. Have you used one, does it work? I would think that it would make sorting ruby from imitations quicker. Thanks for your help.

Best wishes. Thank you!!

I appricaite that you giving me nice help in this regards.

Thanks mate. Very informative. I am not seeing the contrast with the synthetic Alexandrite. Many of my lab collection gems are not so brilliant however the ruby vs garnet is working. Regarding the light source it is the refraction of a bright source ?? not underneath ??

Very interesting and informative.Can it detect natural tanzanite compared to synthetic tanzanite?

You can use a UV torch for the Ruby. Cobalt should florescence

Thank you so much for this video, it has really helped me. I was just looking for more information about the filter and came across this video. I happened to be wondering how I can pick the Aqua from the blue topaz in my parcel and I got the answer here, two birds with one stone!

Interesting video, thanks

is this possible to identify emerald and green beryl

Thank you.

I just subscribed!!!

are useful for jadeite?

What kind of stone is this?

real emerald show a pink color

Hello, I have two stones of the same red color to be with you for sale

I appricaite that you giving me nice help in this regards.