Can glass scratch itself?

Answer from: Beibit Sakhanov:

Yes, it is easy, there are different kinds of glass. The same crystal has a harder hardness than window glass, and in theory you can scratch your window glass with a vase. In reality, it's harder, even "with a diamond" on a ring or "earring" It is not so easy to scratch the glass, you need a rather large stone, from one-third of a carat, otherwise it will not work., Just geometrically there will be no contact between the edge and the glass.

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