Joburg diamonds are rare but, boy, do they have a story to tell.
The story told by three diamonds dug up near Klerksdorp more than 80 years ago is of a time when plate tectonics were first beginning to shift deep inside the earth.
A group of international scientists from South Africa and Canada have used diamonds to take a peek at what was happening on earth 3.5 billion years ago.
The diamonds used in the study came from a collection in Museum Africa in Johannesburg.
“Ancient diamonds are time capsules. They are messengers from way back then,” explains lead author Dr Katie Smart of Wits University.