I had never imagined this discussion could be so much informational.
THanks  a lot to Geology tiger.
The potential of gemstones in Nepal seems very good if we have the skilled labours on the gemstones so that we can compete with the quality exported by India.
Wow, you look a real researcher. The picture is awesome.
I think the gemstone on the picture is kyanite.
I just did this guess because of its blue color, pearly lusture and translucence which best describes the proerties of kyanite. In addition to this, the link you provided above has the information about kyanite. So in light of these I think this is kyanite.  THough I am wrong , I am glad that I now know some properties of kyanite.
Thanks again.