I bought this locket to put my step fathers ashes in and attach to my bouqet at my wedding.  It's fairly large (bigger than I expect 1.5 inches to be), but the necklace is long, so if you wanted to use it as a locket, you could.  I super glued the locket shut with my setp-fathers ashes inside, then ran a bead of glue around the edges of the heart and it worked perfectly.  It's not the highest quality metal, but I didn't need it to be.  I don't think it'd be suitable for younger girls, I would think something more dainty would be appropriate.  It served the purpose I needed beautifully.