sapphire coating on mineral glass?

30739 Views 12 Replies 9 Participants Last post by  Anon
I was just curious what this means:

"Anti-reflective mineral crystal with sapphire coating"

I saw that description on the speedway II.
Is that as scratch resistant as a sapphire crystal?
How do you coat a mineral crystal with Sapphire?

Just a quick question.
Any info would be appreciated.
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