As COL/COM are magical items as well as jewellery, i found that COL is located in Armor category in store, its fine coz it helps to get it fast during arming urself, but i think it should also be placed in Magic Category too. and if in future any Jewellery category is there in store, it should be placed there too.
Not sure about COM though coz i dont hav it, but i think as its also a Crown i will hav the same suggesation for it too .