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With a diameter of about 380km, it is believed to be the largest impact structure on Earth, but also the most deeply eroded.

However, these are not the kind of diamonds that would be use to make jewels - the only thing they have in common with the diamonds we know is density, hardness, and brightness.

The 100km Popigai Crater is thought to have been left by a huge asteroid strike in Siberia 35 million years ago.

The good news is you can avoid said dating disasters with the help of several online dating sites that cater specifically to green-minded singles such as yourself.