This is a lovely two strands of Aurora Borealis Crystal, these graduated strands are 19 and 18 lengths with 2 inch extender. This necklace was professionally restrung so they don't crinkle like many of these necklaces do. Aurora Borealis is a coating that was invented in 1955. The best crystal have this. This is nice and long and is a beautiful necklace. For you from the High Plains of Kansas.