14k yellow gold over solid 925 Sterling Silver...100% authenticGenuine 925 silver...not plated or filled! 5x electroplated in real gold so plating lasts many years! Even if after 10 years plating wears off you can always redip it in gold for $5-10 Highly polished for a shiny look We have 18-30" Great for pendants or wear alone. These items are handmade so chains might vary in weight +- 2-3%Heavy! There are others that sell similar chains for cheaper but the chains are super light so they twist and rip easy!. Ours are solid! Here are weights for the chain in 24" ...if your chain is longer or shorter weights will vary. 2mm - 12.4g 2.5mm - 18.8g 3mm - 29.4g 4mm - 43.7g 5mm - 68.4g Whether you get the skinny 2mm for your favorite pendant or the 90 gram 5mm 30" you will love the chain! Very nicely made Handmade in ITALY Let us know if you have any questions!