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- ...
On this scale, moissanite scores a 9.25, a very good score that makes it one of the hardest substances on earth, and very suitable for every day wear as an engagement ring. However diamonds are the hardest known mineral and receive a 10, while sapphires score a 9 on the hardness scale.