This necklace features a super seven gemstone, also called Melody Stone. It is a rare stone that is comprised of seven different minerals, Amethyst, Cacoxenite, Geothite, Lepidocrocite, Rutile, Smoky Quartz, and Quartz. This stone has become very hard to find lately and I have just found out that is because it is only found in one mine in the world and that mine is flooded out and completely underwater. So who knows if they will ever be able to get back in there ever again. I have set this simply with an open back to let light through. Pendant is 1 inch long and 1/2 inch wide. ♦Chain: Choose from drop down. Will come on oxidized cable link chain with 2 inch extension chain. So if you order 16 inches it will be adjustable from 16-18, 18 inches will be adjustable from 18-20 and so on. ♦ Metal: Sterling silver and fine silver