There's no way to tell from your photos.
Better photos might help, but with gem stones it is important to determine the mineral species, and that requires analysis of refractive index, amongst other things - which cannot be done from a photo. Also, to be proper 'gem' quality, the inspection needs to show the pieces have few imperfections.
All I can say is they look like pieces of quartz.
try a close up with a light underneath shiny through But really Its v difficult these could be anything ( not diamonds i dontthink since they dont tend to wear ) take them to a good jewler But even if they are some kinda gem then theyd be very cheap since most of the price of s atone is in cutting and there not clear