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- ...
TheRichest.com: By Kent Turkeli. The most valuable substances on earth tend to be expensive because of their rarity or because of the difficulty in producing them. However, some materials have an inflated value because of the criminal risk involved in buying and selling these items.