Links of London black pearl earrings, crafted in sterling silver and black cultured pearls
I would say these are medium size.
Genuine – Links of London logo and 925 silver hallmark on silver backs of pearls – see pics 

Condition – new, but I think the backs may actually be yellow gold vermeil, though they fit perfectly, perhaps there was a mix-up at source. I never noticed before. Please see the photos

No box.