What the black dot besides the earpiece of the iPhone 5 white?

I noticed that the iPhone 5 white has the camera on top, but what's the black dot besides the earpiece?

Picture
http://www.foxbusiness.com/technology/2012/09/13/apple-iphone-5-bigger-faster-but-lacks-wow/

Proxcimity sensor, to turn off screen when you put it up to your ear.

This is the Proximity Sensor, previously located on top of the ear piece on models such as the iPhone 4/4S.
It is more less prominent on the Black model because it blends in the the black glass, while it is a lot more visible on white. This isn't to say that it is completely hidden on the black model, because when shining a light onto the area you can see a faint lens under the glass.

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