What's the diff between these?

[Oceanklassik]

Good qns asked . Wld oso like to knw.

[wolfeyes1974]

sapphire glass dial
mineral glass dial
acrylic dial (Tag Monaco..how come they never change it to sapphire glass and still using acrylic??).

which one is more "scratch-proof"? what's the composition of mineral glass? is this an important consideration when you buy a watch??

cheers

james