http://whatconsumer.c...he-sale-of-goods-act/
For your perusal
Were they hinged? (Unlikely I know because of the size)
I wear small earrings, but nothing as small as that in my ears
My nose ring however, is smaller than a 5p piece, was very difficult to put in, it took lots of puling bending and fiddling, cost less than £2 but didn't lose it's shape whatsoever so I would certainly expect a £30 pair to have a lot more sustenance to them so they wouldn't get the indentation of a finger nail
For me, this would seem the earrings are not 'fit for the purpose'