Hi,nice meet you.
In Thailand each year many Thai people go to Mekong river to watch Naga fire ball rise to Heaven.
Sometime people find small and colorful stone or it be egg shape, we call them Naga stone or Naga egg. I believe it can be very good offering to Dragon spirits in Dragon magic.
They come in all size and many color, like red,purple,pink,black,green,yellow,gold,rainbow and silver. It also bring blessings of good health,good wealth, because Naga spirit bind to it.