Guild Wars 2

I have a question about armor stats and I’m going to try to explain it the best way I can. I’ve only been playing GW2 for a couple weeks (love it), so go easy on me if this is a noob question..

Sometimes I will see armor with the stats in green.
Sometimes I will see the stats in white.
And sometimes I will see the stat number in green and the attribute in white.

Could someone explain why this is?? Much appreciation.

The UI automatically compares the stats of an item to the one you are currently wearing. White means the stats are equal, green means the stats are higher than the ones on you current item and red means they are lower.

Okay, and I understand that. But why would the stat be written in green with a white attribute and then sometimes the stat AND the attribute are green? Does an attribute written in white with a green stat mean the attribute is new to you?