Earrings

[Goosestav]

Hello!

I've come across some old earrings from my grandmother, they're silver but I'm not sure if it is actual silver or plated.
Hallmark is the letter B within a shield or a crown type object with the numbers below 2394

http://iforce.co.nz/i/k1y1nraw.fcm.jpg
http://iforce.co.nz/i/cl0ltqfc.o4z.jpg

Any tips or information would be great :)