Same item, different icon

I've noticed that there are several different icons for the same item but I don't know what they mean. For example I have three unidentified partisans one with a teal diamond on its icon, one with a number 1 in orange diamond and one with a C in a blue diamond. What do these mean? Are they an indication of item quality? Where you got them from? Completely meaningless?

@Steweygrrr This is a marker to show where items are stored. The Green diamond is your main shared storage, Blue diamond with a C is Character storage, the 1 in an orange diamond is Extension Storage 1

Nothing to do with quality I'm afraid 🙂