Tortoise shell is a kind of marine shellfish, which was once considered as the whitest thing in Buddhism. Dragonflies, agates and obsidian can ward off evil spirits. Among them, dragonflies and agates belong to one of the seven treasures of Buddhism, which not only ward off evil spirits, but also keep peace. Obsidian, known as the "King Kong Warrior", has a strong role in avoiding evil spirits. The key is whether you like it or not.

Dragonfly, agate and obsidian are all low-grade gems with very low prices. There are many wholesale shops in Lianyungang, which are cheaper. Guangdong can also go to Liwan District, Guangzhou, where there are many processing zones and wholesale stores are more affordable. If you are in Shanghai, you can visit Crystal Street, the Temple of the City God. Or the landlord can also visit Taobao. Dragonflies and agates can actually be bought in temples.