PandoraPandora Icons Armband, Silber, mit herzfrmigem Verschluss und Cubic Zirkonia

Is this an authentic pandora bracelet? i purchased it and from what i read on the internet, the lettering on the bracelet is not authentic pandora

Does it include the original pandora gift box? and is original pandora?

I was wondering if 6.3 is Pandora's size or normal size?

If my wrist is 20cm would you recommend medium or large