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the claim

A diamond can cut glass because diamond is harder than glass.

the verdict
INSUFFICIENT LEANING
Recorded sources
8 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that a diamond can cut glass because diamond is harder than glass?

Unclear. Several sources show diamond tools cutting or scoring glass, and one source notes diamond ranks 10 versus glass at 5.5 on the Mohs hardness scale, but none directly states that diamond cuts glass because it is harder.

Verdict: PARTIAL LEAN · 8 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 8
Can only real diamonds scratch glass?
2012
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Can only real diamonds scratch glass?. (2012). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/7904/can-only-real-diamonds-scratch-glass

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More for · 7
Research on Critical Cut Depth of Glass BK7 in Diamond Cutting
2013
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Jia, P. (2013). Research on Critical Cut Depth of Glass BK7 in Diamond Cutting. doi.org. https://doi.org/10.4028/www.scientific.net/msf.770.230

High wear-resistance characteristic of boron-doped nano-polycrystalline diamond on optical glass
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High wear-resistance characteristic of boron-doped nano-polycrystalline diamond on optical glass. (n.d.). cir.nii.ac.jp. https://doi.org/10.1016/j.diamond.2016.09.014

A Review of the Precision Glass Molding of Chalcogenide Glass (ChG) for Infrared Optics.
2018
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Zhou, T., Zhu, Z., Liu, X., Liang, Z., & Wang, X. (2018). A Review of the Precision Glass Molding of Chalcogenide Glass (ChG) for Infrared Optics.. doi.org. https://doi.org/10.3390/mi9070337

Ductile mode cutting with torsional vibration for glass material
2003
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Tangpornprasert, P., Warisawa, S., Nunokawa, K., & Mitsuishi, M. (2003). Ductile mode cutting with torsional vibration for glass material. doi.org. https://doi.org/10.1299/JSMEMECJO.2003.4.0_279

The strength of waterjet cut float glass
2025
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Veer, F. & O'callaghan, J. (2025). The strength of waterjet cut float glass. doi.org. https://doi.org/10.1007/s40940-025-00293-4

Drilling of Microholes Using Diamond Grinding Tools
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Drilling of Microholes Using Diamond Grinding Tools. (n.d.). cir.nii.ac.jp. https://doi.org/10.4028/www.scientific.net/amr.1136.435

ガラス状カーボンの延性モード切削
Get citation
ガラス状カーボンの延性モード切削. (n.d.). cir.nii.ac.jp. https://doi.org/10.2493/jjspe.66.1927

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