Fili was trying not to let his exhaustion show, but his feet were beginning to ache, while trying to wade through the collosal piles of gold and jewels. It was becoming harder and harder the further he and his brother went. One wrong step could bring an entire mound raining down, and their search would have to be halted, or become slower. No doubt that their uncle was beginning to lose his patience as every minute passed. They had been looking for so long that he knew that his baby brother could collapse at any minute. The last thing they needed was to have Delva in the room. Not that he didn't want her to, but he didn't want their godmother to get further in her silent anger towards Thorin.

Once out of the eyesight of their seemingly disturbed uncle, Fili took the opportunity to pause in their search. If he caught them resting, he would certainly put them back to it. He sat upon the endless pile of their family's wealth, exhausted. Honestly, he didn't know what to do; being close to Thorin, he couldn't dissapoint or disobey, but when it comes to Kili's sake, some measures needed to be overrun. Fili's loyalty has now split; he admired their Delva deeply, maybe not as deeply as his brother, but enough to fully trust her. Thorin, on the other hand, was his uncle, and current predessecor. Becoming king would be underway, and their uncle entrusts that his heirs would follow his every word, but in this circumstance, it has put Fili and Kili in the middle of chain that could only get so far. Tied between Saeril and Thorin, the brothers were in the middle of tug-of-war. 

"Remember the stories, Ki'? There was only one Arkenstone; a large white gem that shined the brightest of lights. It's really impossible to miss", the eldest reminded him. Maybe this'll help. "As luminous as Delva's eyes", he added as an afterthought.