Jovivi Seven Star Group Natural Amethyst Chakra Crystal Sphere Ball with Black Obsidian Stand w/Box Black obsidian Foundation dimensions:5.0*0.6cm. Amethyst diameter:18mm. Other stones are about 14-16mm. Includes the following chakras: Amethyst, Rose Quartz, Red Jasper, Tiger Eye, Green Aventurine, Black Obsidian, Rock Crystal quartz. Quantity: 1set/pack. Comes with a Beautiful Gift Box Weight: Approx 88g / set. The picture is only for your reference,The stone you received will be similar because of the natural stones. Use for reiki, healing, meditation, chakra balancing, or ritual. Can also be used in conjunction with a chakra wand.