I bought these as a pair (see the hound) 
this one is finely modelled terrier head, i'm not sure which breed, she is wearing a blue ribbon in her hair and a plaintive look upon her face. Modelled in almost three dimensions, with a high carat gold back and small gold bail with silver set teeny diamonds.
A rare find!
 
weighs - 5g
measures - 24mm x 25mm
English circa 1880
Excellent condition