Natural & Synthetic Mixed Stone & Lava Rock Stretch Bracelets, with Iron Beads, Size: about 2 inch(49mm) inner diameter, bead: 3~8mm in diameter.âPlease Note: These Gemstone may include Natural Dalmatian Jasper, Blue Spot Jasper, Amazonite 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.