A charming Victorian era goldfilled locket from one of my antiques market trawls in London, it has the marking for S.K.M. & Co within a shield on the inside. (This company was in business from the late 1800s to the early 1900s, with their last listing found in 1915 -- worthy of the term antique!)
I've kept it simple with a twist by using a mixture of vintage & new, gold & brassy chains with a trail of hematite and a single tiny vintage crystal drop accent. Necklace measures approx. 18" while the locket pendant is another 1".