I'm pleased to say that I did the same thing and got the same result. This morning, I got my peridot. Yay! I'm not going to speed it up, but I have it, so I'm really excited.
Yesterday I bought about 12 of the peridot decorations and put them around my breeding cave - did it on my iPhone, so no real order to them. When I saw them this morning on my iPad I thought it was time to move them. They looked out of place! Some I couldn't move because they were too close to the breeding habitat, so they will stay there for a while. But I did manage to move 6 of them onto another island. I then put in my crystal and cactus, and what do you know - a peridot. That makes up for the 3 crystal eggs I have waiting to be sold!