Apple Watch Glass 42 mm
Where can I buy new glass for my Apple watch 42mm?
Announced September 9th, 2014, this device is Apple's first foray into smart wearables. iFixit's repair manuals are applicable to Apple Watch (steel) and Apple Watch Sport (aluminum).
I believe it only comes with the OLED and glass digitizer preattached.
Saying this, it is also a difficult repair and you will damage things opening it.
Opening it will also make it lose its water resistance, I would highly recommend you take it to the Apple Store. :-)