diamond , raw stone white little imperfection glassy looking?

I am sorry but your question is impossible to answer on a forum like this. Without examining the stone there is absolutely no way of anyone estimating its colour or the potential weight yield after cutting. Your first step should be to take it to a reputable jeweller to have it verified as a genuine diamond, your description as being glassy looking does not ring true as the lustre of diamond is not glassy.

Check it out mate......... all that is looking like diamond is not diamond. Diamond is supposed to be the hardest natural substance on this planet. So... my advice is try cutting a piece of real diamond with it....... OR try scratching it with a piece of real diamond........ and check it out for yourself.

Their are other ways also, to check it ..... in the gemstone labs........

If its truly diamond, I would take it to a jewelery store. they could tell you how much its worth.