I'm not sure why this should be a particularly large number. Obvious candidates:
Au - circuitry
C, H - plastic
Si - glass, chips
Al, O - corundum
Whatever powers the battery.
Whatever else goes into the chips and circuitry.
> there were probably 100s of innovations just to mine and purify and machine sapphire in past 100s of years so that in 2000s we can finally produce acceptable quality tiny camera lens
"Purifying" sapphire doesn't make much sense. You'd want to melt it, get the iron (or whatever colorant) out, and reform it. It's easier to just start with pure aluminum oxide, which is what they're doing.
As far as I'm aware (and I'd love to be corrected, since gems are a personal interest), the general method of machining gemstones is to abrade them against a surface coated in invisibly small diamonds. How many innovations you want to count in the process is, as always, somewhat flexible; but it's fairly cool technology.