There were a few people who held some negative views of this gem. They also said if you sinned or your lover was unfaithful, your diamonds light would go out, leaving you with a dead, dark stone. The diamonds healing properties we purported to include curing leprosy, insanity, bladder infections, and the plague. The diamond is the only gem made of a single element, Carbon. All other gems are combination of two or more elements.
Diamonds have an isometric crystal structure.
This also gives the gem its optical properties. One of the most notable is that it is singly refractive. This means that light is not split when it enters the stone. Most diamond simulants such as C.Z. and Moissonite are doubly refractive. If you look through zircon or synthetic rutile under magnification, in most directions you will see double images of the facets on the other side.