Images on Depop adds shows a pair of earrings, one of which is a small key paired while the earring for the other ear has a small clear, zip lock bag with a white substance inside

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Former drug addicts hit out at "irresponsible" jewellery designers making substance inspired earrings- Viral News - Deadline News
The letters are believed to be a reference to class B drug Ketamine which possessing can end up with a 5-year prison sentence. - Viral News