I don't quite understand what you said. The jewels fell into the sewer, trying to get them out, didn't they? Jewelry is not easy to find because of its small size. However, if you accidentally drop the jewelry into the sewer, if there is no drainage at that time, you can look for it at a low position near the drip port. If drained, it may be washed to the next place. At this point, please observe carefully in the following order:

1, the earliest sewer trap (remove the cover of the trap, some are downstairs);

2. The lowest end of the sewer riser (if the pipeline leads into the drainage ditch, where the pipeline enters the drainage ditch).

Good luck and find it smoothly.