yup
I have a sandcast belt buckle the same way..the proper way to fix it is to take the stone out and repack it. but very few folks can do that anymore. (and get it to fit in the original space properly)
Also about color, very little turq is a true blue anymore. (only some of the most expensive like Bisbee and the like. most of it is color treated or at least stabalized. I had a watch band that had 24 chips of turq (not chipped ) but each chip was a solid chip of turq. It started out a bright blue, and the oils from my body changed the colors of each chip to a different shade of green. I actually prefer the green, Except for the Bisbee Blue and Sipider Mountain. My favorite was from the old Morenci mine. green with a golden color matrix.
curley