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The metallic element Zirconium (Zr) has a Moh's hardness of 5.0, this is not hard enough to cut glass.

The crystalline compound Zircon (zirconium silicate ZrSiO4) has a Moh's hardness of 7.5

7.5 is harder than Quartz and therefore Zircon will scratch glass.

The crystalline compound Zirconium dioxide (ZrO2), sometimes known as zirconia (the one that looks like diamond) has a Moh's hardness of 8-8.5. This too will scratch glass.

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