Other mass-market uses for small rubies are for bearings in precision gear train... | Hacker News

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avhon1 7 months ago | parent | context | favorite | on: Synthetic diamonds are now purer, more beautiful, ...

Other mass-market uses for small rubies are for bearings in precision gear trains, and wear-resistant tips for precision measuring devices.

thaumasiotes 7 months ago [–]

Why would those need to be red?

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