Your friends will sue you, otherwise the business won't win.

1. When you delivered the goods to your friends, there were no quality problems and no missing parts. Later, one piece was missing. It must be the wearing problem.

It is impossible for your friend to ask the merchant to return the goods at double price. Whether there is water or not is meaningless. If everyone buys jade and says that they have raised water, they all ask for double return. What business does the merchant do? As long as people are willing to repair it, jade itself is fragile.