The hole with bones and gems was typical Larian humour =>
you acquired an item => true, it was a bone. As soon as you have gathered both gems, the description of the text will change. (You see only bones).
And closing the hole => "you have enough bones for a dog".
I needed 5-13 attempts and in my case => simply laughed.
Illusionary walls => do some gamers really need everything printed out in explanations?
Kiya <shaking her head in disbelief>