Mostly the glass melts. The common example can be seen in a glass shop where hollow objects of various shapes are formed -- tubes, lamps, glasses, mugs, etc. See the related link for stunning objects made.
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You would have to have a glass eye.
The diamond, being one of the hardest natural materials, will likely scratch the glass surface due to its superior hardness. Conversely, the glass would not be able to scratch the diamond due to the diamond's hardness.
it would sharpen
increase
It would increase
Cutting a piece of glass into four smaller pieces would not change the density of the glass. Density is a property of the material itself and remains constant regardless of its shape or size.
it will tear up all your insides and die
it would become pickled
You would have to live with them for a while first as a trial
The plant will face stress and its growth will be stunted
It's Pressure would rise.
you would become the opposite gender