Tridacna is the whitest natural substance in the world and a very rare gemstone that has been used in Buddhist relics. Tridacna is a genus of saltwater clam that have heavy shells with folds in them. The stone is made from the clam in its production of pearl-like stones, and the shell is also used. Tridacna stone helps to soothe frazzled nerves and calm the entire body, and it also helps ease insomnia. It’s also said to reduce blood pressure, promote good metabolism, and provide anti-aging benefits. It can also help prevent and ease the effects of osteoporosis.