Jade? Jasper? I suspect it's a dyed stone, but I can't be sure. I think the elastic is worn out, so if you're making it into a bracelet, please restring it. If you're displaying it as a stone, please cut the elastic. Pale green, inner diameter approximately 17cm Largest bead size approximately 6.5mm Mint green, inner diameter approximately 17cm Largest bead size approximately 6.3mm