These necklaces are made with natural hemp and suede. We wrap the rock with a net pattern to keep it from falling out. The necklaces are about 22"-26" long and can be made in any color. I also have rocks in pink, purple, teal, and green if looking for a not as natural stone. All stones are lightly tumbled some are rougher than others. At purchase just advise the colors you would like and the preferred length.