
The bottle could perhaps illustrate a heart rather than an apple?
Although perhaps it might be too graphic for romantic ideals.
It looks as if the decor was produced using some sort of resist technique, where clear and red glass introduced when hot refuse to mix with each other and create this lacey holey (or blood vessels) effect.
I have been trying to find out what Porpora is, as a technique for decorating glass, but rather unsuccessfully.
It seems to be a maker's or artist's name.