Previously, he heard from Ximen Guan that some Demon Spirit Gemstones would bring a bloody disaster, just like the Doom Diamond.
When the people of the Eternal Heaven encounter such gemstones, they often find a "substitute" to contract with the Demon Spirit Gemstone, and then observe secretly.
Once the substitute has contracted with the demon spirit in the gemstone, the Eternal Heaven people kill the substitute to take back the Demon Spirit Gemstone.
They use the process of observing the substitute's contract to find a safe way to contract with the Demon Spirit Gemstone.
They have used this trick many times on the Doom Diamond, but until the diamond ended up in Ximen Guan's hands, they still couldn't find a safe way to contract with it.
In the meantime, many substitutes died.
If this necklace was indeed deliberately sold by the Eternal Heaven to the Big Mine Master, then unquestionably, Ah Xiang was a substitute, and maybe the Eternal Heaven person is hidden within this estate.
