In the Hindu religious tradition, the tulsi, or holy basil, plant serves both as an important symbol and also as a popular medicinal remedy.
Diamond use to be the hardest known natural substance now it is the mineral lonsdaleite at 58% stronger then diamond is the first the second hardest is wurtzite boron nitridâ¦e at 18% stronger then diamonds they are both extreamly rare natural minerals sources http://www.newscientist.com/article/dn16610-diamond-no-longer-natures- ...
What is the hardest stone in the world? The answer is Bile.    previously diamond was thought to be the strongest stone in the  world however diamond is in fact a crystal and a new stone known as  Lonsdaleiâ¦te has been found to be 58% stronger.