Apatite (Throat, Solar Plexus): The Weight Loss Stone. It has often been said, before you can change something, you must accept it as it is. This is very true for most people where excess weight is an issue. An Apatite gemstone crystal is a multi-talented gemstone helping us attune to our inner selves and accept the healing, communication, balancing and teaching it has to offer. Apatite gemstone is perfect for those with weight problems.