I'm so sorry to all of you who have lost jewelry or had it taken from you. It's devastating to lose something precious if it's sentimental, valuable or both.
My MIL loses jewelry constantly - including one beautiful diamond suite of mine (given to me by my parents) when I gave it to her for safekeeping. I was heartbroken as I loved the pieces & because it was specially chosen by my parents. It was also very valuable. To be fair, it was stolen - not lost - along with a lot of her jewelry on a trip. The thing I don't understand is how she manages to carelessly misplace almost all of her jewelry at home & on vacation. I can't tell you how many times we've all scoured hotel rooms or their house looking for her latest misplaced item. I just don't understand how she can stand spending so much time looking for her jewelry & watches - sometimes never finding it.
We have all tried to help her out by giving her countless ring holders, pretty jewelry dishes, jewelry boxes, rolls, pouches, valet trays & a hard LV jewelry case from my FIL. They also have a vault in their home which my FIL won't give her the combination to open. With anyone else, I would say that's entirely inappropriate - but it's actually the only way to make sure major pieces are safely held when they're in the house. The major stress is when she can't find something & starts accusing their housekeepers. That's just uncomfortable for everyone :wondering
I'm a bit hyper about keeping my jewelry in the same places, putting away unworn pieces in our vault & keeping larger pieces in the bank. I did once drop a diamond stud in my sink. I couldn't believe how quickly it just disappeared down the drain. I turned off the water & completely panicked thinking it was gone. The plumber came over & managed to rescue it from the "u-shaped" thing under the sink

Now I diligently plug the drain & put a plastic hair strainer over the closed drain when I'm rinsing or cleaning my jewelry over my sink. This is also the reason there is a ring holder next to every sink in our place including the guest bathrooms. I have no desire to experience that heart-stopping moment again!