Re: @Dave 126
>Seiko also seems to be allergic to sapphire though.
Because they have their own Hardlex mineral crystal glass:
Sapphire is near impossible to scratch but more brittle, thus prone to cracking or shattering if dropped wrong or from too high up. Hardlex isn't quite as scratch resistant as Sapphrine but it less brittle and thus unlikely to crack or shatter.
From experience, a Sapphire glass is likely to shatter under a point load leaving the watch face exposed whereas the Hardlex will crack. Thus for me, I'll happily skip the Sapphrine price premium.