Okay, this picture isn't really of diamonds, it's of graphite. But graphite and diamonds are both made out of the same stuff (carbon), but carbon just has different physical forms. This picture shows different forms of graphite and how scientists just discovered they can manipulate graphite's physical form. Graphite is usually softer than diamonds, but when put under a lot of pressure, it takes the shape of a diamond and both look pretty similar. However, when the pressure is taken away, the graphite goes back to it's original form.
Even though I don't personally think graphite is as "beautiful" as diamonds, I find the chemistry and manipulative properties behind graphite more beautiful than the form of graphite itself.
If you want to read more about this, check out this article: