https://youtu.be/mbIb7KA6HvM Length: 40cm Package size: 0.95*0.75cm This is a soft and special lake blue crystal opal. Partially deep blue purple light Staggered color with different angles Light perception is very psychedelic Selected single gemstone production Not sold Maintenance related matters: This is a stable quality Australian protein. It is usually stored in a zippered bag and placed in a cool place where it is not exposed to the sun. Use a mild soap and other detergent. After washing, wrap it in a soft tissue. The opal is a delicate and precious gemstone. It has a low hardness and is easily cracked when it collides. It is also resistant to chemicals. Please do not use silver-washed water in the stone table. Always avoid high temperature environment and acid and alkali chemicals.