Two green coloured stones- one is certified as Emerald and another one as Beryl, while both the stones have been cut from a single crystal. Why is that so?
Emerald and Green Beryl- both belong to the same species- Beryl. The difference between the two is the presence or absence of Chromium, which is detected by a spectroscope. If a stone has chromium content, spectroscope will exhibit lines in red region that concludes the stone as an emerald while in case of green beryl there is no absorption in red because of the lack of chromium content. In a single rough crystal, it is possible that one end has got the chromium concentration and another one none.
