Sapphire crystal

Second, attempt at typing this. Internet signal was lost. 😱🤬

I never realised until just now, while watching a YouTube prog. about watch jewels, that the sapphire lens on the watch is the same material as that of the jewels in the mechanism. But without the red dye.

I have at least one Waltham that has clear pallet jewels. I wonder why they are dyed red, is it just a hangover from when the jewels were real rubies?

You can all laugh now, as you probably knew all of this😝

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Yes. Originally natural rubies were used. Now synthetic is cheaper & easier. Most companies colour their jewel bearings red, but some do other colours too. 👍🏻