Two takes on colored glass. Key in both is the clear factor. Unless the glass is opaque you still have to be able to see through it. What stumps the beginner is how to make the glass look clear and still show the color. The painting on the top is probably closer to reality but the lower one also "communicates" colored glass with out the color inside. Personally, I believe that communication is one of the primary, if not THE primary function of the painter, right up there with expression, so I am willing to go with simply communicating the subject. Any more explanation can be beautiful - or just redundant. They both work because they are both clear, shiney and show some color in the glass.
Stay tuned for cut glass.