Color variation of the stones is expected as no two pieces of stones are alike. Every authentic piece of stone is a distinctive piece of art crafted by Mother Nature over centuries using heat, pressure and a lot of minerals and organic matters. The way these minerals settle into the stone is what gives it the diversity of colors.
Please note that while the powers of the stones are well-documented and have been proven to bring various benefits into people's lives, they are not substitute for medical advice. Should you have any medical concerns, please consult a licensed medical practitioner.