The dots on the door say "CUT" if you use cut the door will go away! In the cave you can find 4 things to check they tell you "UP,LEFT,RIGHT,DOWN" if you fall down the holes in this sequence you will find the sapphire there is one more thing you can check however i don't know what it says.
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use cut
use cut
try to take the sapphire inside the dotted hole and the scientist that was once blocking the door to the dotted hole will tell u (to get inside the dotted hole form it into a question and type it up in the bar above)
Up,left,down,right.
this is the translation: