I have a bunch of stones that I popped out of old settings that I sold for scrap too.
Also, I have stones that I purchased many years ago because I was on a gemstone addiction for a while. (sad, but true).
Anyways, I carried a pair of round tanzanites around for over 10 years and finally this year I had them made into a ring.
So don't be in a rush to remake them into jewelry or sell them. I just keep the other stones in my jewelry box and when the inspiration hits, you'll be ready to get a nice new piece!