Natural Mixed Gemstone Graduated Beaded Necklace, Chakra Theme Necklace for Women, Size: about 20.87 inch(53cm) long, beads: 6~14mm in diameter.âPlease Note: These Gemstone Include Natural Black Onyx, Natural Red Aventurine, Natural Tiger Eye, Natural Green Aventurine, Natural Red Jasper, Natural Howlite, Natural Lapis Lazuli, Natural Amethyst.