There was a famous advertisement saying “diamonds are forever.” However, I think not many people know why it is so.
It may come from the image that diamond is the hardest on the earth, with a hardness of 10 degree.
Even the newest diamond is a billion years old. The oldest diamond found ever is 6 billion years old. Thinking that this earth was formed 4.5 billion years ago, where those diamonds come from? What is more, there are no newly formed diamonds after that. All the diamonds are formed at least a billion years ago.
So, where did they being formed?
About 200 to 250 km under the earth, diamonds were born and stayed there with no cracks and untouched until humans would find them.
They will stay unchanged next a billion years, for sure.
Every material on earth will change and be damaged.
Diamond is the only material with no change. Therefore, only diamonds hold continuous time which has not and will not be changed.
