Shooting a reflective surface can be a little tricky because you need to set your lights and camera up in such a way that they will not reflect in the object you are shooting.
For this photo I ended up using three lights, one over and a little behind the sunglasses with a blue gel, one hairlight behind and off to the right of the sunglasses with a yellow gel, and finally a fill light off to the left with an octobox in front. The camera was positioned in front of the sunglasses facing up with a 100mm Macro 2.8 lens.
Lightroom was used for the white balance, Photoshop for removing the string holding the glasses and any other flaws in the image. To add a little more contrast to the glasses I used NIKs Color Efex Pros “Contrast Only” and then masked out the background. Finally I sharpened the frames of the glasses a little bit using a High Pass filter in Overlay blending mode and added some vignette in Lightroom.
For this shot I used a Canon 5DMKII, 100mm f/2.8 Macro, 1/60 @ f/8, ISO 100