This piece is made from an upcycled blue glass bottle. We actually found a blue bottle, crushed it into small pieces and put it into our tumbler to see what would come out. The pieces smoothed on the edges and and the finish became matte, much like sea glass but much, much smoother and silky. This is such a beautiful cobalt blue color that we decided to drill the center and add a Swarovski crystal on each side. We then added a sterling silver bail and placed the pendant on a sterling silver 16" box chain. Other lengths of chain are available at an additional cost below.