There is No Way for any fabricator to predict what will happen with natural stone once installed. You can see from the slab picture to what was installed that it is the exact same stone. They captured a lot of the huge mother of pearl pockets that is in the material, There is also mica, Quartzite and then the Amethyst pieces in there. There is quite a few natural stones that will discolor or oxidize over time. If you wanted total control over the color of the product then maybe a quartz would have been a better option. This is just mother nature in all her glory - "she" is a woman after all and loves to change her mind on things.