Our locket measures 0.6 inches and is made of 18k gold vermeil with hand painted enamel. The gold-filled chain is adjustable to 16-18 inches. As always, this enamel heart necklace locket is made to last for a lifetime of love. It can be opened to store a mini photo or anything else you need to hold close. (Outer) locket dimensions: 10mm width x 10.65mm height.  A tiny photo can be placed inside the heart locket pendant using approximate dimensions : 5.5mm width x 7.75mm height.