How cool!
A Substantial Victorian bracelet modelled in high carat gold and designed as tree branches intertwined with a sky blue enamel ribbon that is pave set with diamonds to spell SOUVENIR (a memory/remember me) 
Presented in original fitted horseshoe box with gold internal branding 'J. Speltz FILS Frankfort s/M' (so perhaps German?)
 
weighs 57.2g
 
circa 1870
 
excellent antique condition
 
measures  25mm at the back and 45mm at the front
the clasp has two settings so it measures internally 6" and 6.25" - so despite being substantial it is not big