solely off of the pictures I would lean towards topaz, however its possible its just a yellowish quartz, SG and RI should easily determine.
I too am going solely of the pictures, I the same as Douglas at first, but as I scrolled down, I would have to lean towards Douglas’ thought of Smoky Quartz. That would give you at least a place to start your research.
I am not saying it is that but a good place to start. As a Gemologist you should never identify by pictures.
Good Luck Sir