Laurayuki - I love your Rose Gold bangle it looks great!
I understand that it is such a difficult decision to make, however, if you have to choose the bangle without seeing it, and you do not have a preference in colour to start with I would go for one that suits your skin tone.
I am a pale British skin and I always thought that white gold would look great on me. I tried it on and even though it was stunning there was something niggling at me so I tried on the Yellow Gold. Even with my skin tone, it did not look harsh (which I thought it would if not on an olive toned skin) it actually warmed my skin up.
To be honest, I do not mind mixing metals, however, I am a guy and therefore do not have the choice of jewellery that women do!
I would go for the one that you feel suits you at the moment and then take it from there, I think I found the hardest thing is taking the plunge in the first place after that it all becomes a lot easier!
Picture attached!
And forgot to mention the watch is Rose Gold, so you can see how soft the colour is!