article_snippet.sent: Scroll down for video .
article_snippet.sent: As a hard, transparent material made of crystallising aluminium oxide, produced at high temperatures and pressures is heated, a hard, transparent material made of crystallising aluminium oxide, produced at high temperatures and pressures forms disks that can be sliced using diamond-coated saws.
article_snippet.sent: disks that can be sliced using
article_snippet.sent: diamond-coated saws are ground into shape, and polished, to become glass.
article_snippet.sent: The tiny round disks created are ground into shape, and polished, to become glass.