RockHard Necklace – on 925 Sterling Silver with a Black Diamond. Very omni-gender jewellery! RockHard Collection – a symbol of Friendship, Trust and Safety. Inspired by rock climbing, mountains and the outdoors. The piece measures about 20×15 mm (0.79×0.78 inches) Your RockHard Necklace comes on a 2mm x 70 cm (27.5 inch) BallChain unless other requested in message as you order. Strong and sporty. Worn by many Friends! Climb on – on rock, ice, in life and work!