Evolution caused the rock deposits on its body to erode away, revealing a wide variety of beautiful, yet venom-filled jewels.
Since its venom doesn't affect its jewels, the jewels are without flaw. After being removed and de-venomized by professionals, the jewels can fetch a high price at jewelry stores and auctions.
It will let people take its jewels to be de-venomized if pleased. However, if angered, it is quick to bludgeon the culprit with its rattle.