Pastacuita Barcelona uses pewter metal bases plated without nickel (non allergic bath), in accordance with European standard. Clasps and chains are of the same quality than the main piece. . Our jewels are handmade, using mainly polymer clay handled with different techniques such as “Millefiore” “Mokume gane”, Varnishing and Particle lineup. Our items may show slight differences regarding photos due to handicraft manufacturing process, that provides them with a unique touch. . Our pieces do not lose color in contact with water as they are not painted. Necklace threads match main color of the piece. . Main piece diameter: 0.42 inches . Necklace thread length: 15.36 inches + chain of 1.97 inches. If you want to change the necklace thread length, please tell me when shopping.