I'm usually not particularly interested in jewelry (though I can appreciate it in practice when utilized particularly well) but I quite like this.
The geologic time scale is perhaps the most basic and essential reference used by geologists, so it has a special place in most geoscientists' hearts.
I'm not a paleontologist or particularly interested in fossils (though I understand the fascination many people have with them) but this is definitely a more compelling piece/collection than something similar done with plain rocks and minerals would be -- though actually I still think that'd be cool.
In fact I'd like to see displays set up like this in museums (comprised of fossils along with rocks and minerals to fill out the rest of time), so you could walk by and touch all of geologic time in a few seconds. A lot of times the rock and mineral rooms are pretty boring (though I'm sure I have a different perspective on it than most).