A tricky subject.
First, there are some things we should all be aware of.
Ever felt drawn to a particular thing? Like it's calling to you?
Maybe it is.
All things come to us for a purpose, be it crystals or clothes or books. There is something they can help us with, or perhaps we can help them.
There is also a time when they leave us.
A particular ring you've always worn comfortably one day slips off your finger and you never see it again.
Lost? Perhaps not.
Objects move on. Once they've stayed with you as long as they need, or you need, it's time for them to move on. Perhaps they will work with the Earth. Perhaps they will find someone else who needs them. But the fact is, they are needed elsewhere.
However, here is a little visualization you can do that may help you find them quicker:
Imagine the lost object with a long, silver chain attached to it. You have the other end of the chain, and slowly you reel it in, until the object rests in your hand.
Within a few days, the object should turn up again, if it's still meant to be with you. If not, it's probably moved on, meaning it's time for you to shrug and move on as well.