does this come with a necklace or just the locket?
Chain is included.
Can the back be engraved?
You could take to a jeweler and have engraved. Not much room but you could have initials or something short.
The heart-shaped Always Together stainless steel urn pendant has air tight threaded top opening for storing a small amount of ashes, lock of hair,sand from a favorite beach, or other precious memento. Crafted in quality .325 surgical stainless steel, this pendant won't tarnish and wears well. The sentiment "Always in my heart" is engraved on the front of the heart.