Your motion has been approved of, but I am afraid the interested feline party, that being myself, has not heard which one specifically draws your attention, [@KimHanuel]. For someone so aware of the various options and the rationale behind them, I am hardly disappointed, so kudos there; few give such seemingly arbitrary questions much passing thought or depth. That said, there can only be one particular favorite which is loaded with meaning to you. Many favor their birthstones, others choose symbolically, some are just partial to their attributes or supposed mythical properties, and others yet benefit from all these and more.