We all love a good snake piece, and I look at so many. This one totally won me over with the fantastic detail to the bale. A snake bale is something I have never seen, and I'm a sucker for a cool detail. 
This late Victorian locket was most likely worn as a mourning piece, with the locket back used to contain hair of a beloved. The gold snakes contrast the onyx oval so beautifully. 
The larger snake has diamond set eyes, just for an added twist. 
This is a special piece, there's no doubt about it. 
Tests as 15ct gold, aside from the locket aperture, which is gilt. 
Weight approx 26.4g 
Total drop approx 60mm 
Width approx 33mm 
Excellent antique condition