In the time I've played this game there was only one worthless trinket that I consistently slathered over -- the Magma Scamp.
I'd see these fiery little critters scampering about occasionally and immediately knew it was for me. So, in hope this darling little creature might eventually show up in the Crown Store, for gems, I have clung to my gems with a certain zeal.
Today, I found my magical critter for a modest cost in gems and did not resist even a moment to acquire him. This was a very good day.