Round Natural Lava Rock Beaded Stretch Bracelets, with Antique Silver Plated Alloy Spacer Beads and Natural Gemstone Beads, Size: about 2 inch(5.2cm) inner diameter, beads: 8.5~9mm in diameter and 7.5x3mm.âPlease Note: These Gemstone may include Natural Amethyst, Carnelian(Dyed & Heated), Lapis Lazuli, Lava Rock, Synthetic Howlite, Tiger Eye and so on(as the picture shows). but as it is a mixed product, the stone type is delivered randomly, please refer to the actual product delivered.