It is scientifically possible because carbon is the basic component of the human body, as well as diamonds made up of crystallized carbon. In recent years, researchers have also developed methods to plant diamonds in laboratories.
One of the leading companies in the field of converting the ashes to diamonds is Algordenza, with branches in 33 countries.
A company spokeswoman told Business Insider that they sold about 1,000 diamonds in 2016 alone.
In a video posted on its website, the ash-to-diamond conversion phases, which take a few days, show high levels of pressure and heat.