> Each carat of mined diamond has a footprint of over 100kg of carbon dioxide and over 500kg of greenhouse gases in total.

The report by Imperial College London Consultants, cited by Sky Diamond, highlights the environmental and climate costs of mining so-called precious stones:

http://www.imperial-consultants.co.uk/wp-content/uploads/202...

One more reason to ensure that synthetic diamonds cannot be identified or differentiated as such, given the high environmental impact of extracting that carbon allotrope from the ground.