Little Star Adult Collection Sterling Silver Chain Necklace With A Diamond Detailed Open Heart Pendant:. Naya – Our Adults Sterling Silver Open heart Diamond set necklace is a perfect gift for someone special, on its own or as part of our Mummy and Me set with the smaller Neena necklace. Simple yet stunning necklace that would add charm and style to any outfit, the delicate chain is adjustable 41 to 44cm. Gemstone: Diamond 1mm Heart Size: 16mm x 14mm Age Guide: Teenage to Adult Chain Length: 41cm – 44cm