The sea glass is set in fine silver bezel, the chain is sterling silver. I've shaped this sea glass piece myself, you can see how it looked before on the last photo. 2.5 cm long and 3 cm wide. Sterling silver extendable chain 18-20 - 45-50 cm. My pendants are hand made by myself in edinburgh, scotland.I only use genuine and natural sea glass. Bezel is made of fine silver. Your necklace comes with a custom made eco-friendly presentation box, tied with a silver string. I tried to reduce as much carbon footprint as possible when choosing and ordering the packaging. My boxes are made in the eu and my supplier guarantees that the glue, paper and cardboard of the box are 100% eco-friendly and the cardboard comes from a fsc certified forest, where no more wood is cut down than the forest can reproduce. The necklace will be delivered to you by fully tracked royal mailsigned for 1st class (uk orders) or royal mailinternational tracked & signed service (international orders). Please take a good look at all pictures as they will tell you more about the quality than words. This item is made of glass and silver.