The story of the snake gem is quite old, and in the movie, there are often many incidents about the snake gem.
The snake's head is naturally toxic and does not form, or the venom of the snake is made in a venom gland and the poison flows from the gland to the teeth, and the poison is released through the teeth at an excessive rate, which is caused by the accumulation of venom in the snake's teeth for a long time.
At one point the venom came out and at some point the poison spilled on their head and dried up and became crystalline, then it was called the ‘snake gem’.’