Short answer: The Gemini laser can indeed treat facial freckles.
Long answer: There are a number of reasonable treatments to remove or fade freckles (ephileds), but the most important thing to know is that these can come back with sun exposure, so you will need to protect yourself from the sun with a good quality UVB/UVA blocking sunscreen daily after your treatment.
The Gemini is an excellent laser. When set in the 532nm KTP mode, this laser can be tuned to treat brown spots, red spots and improve overall skin tone and texture. It is superior to IPL in that the therapeutic window (treatment effectiveness / side effect) is better because it is an actual laser and not a wide-freuency light source (such as intense pulsed light or IPL).
Although Gemini (KTP) is an excellent choice, you should know that although your darkest freckles will go away, your lighter freckles will remain. The laser works on color contrast and the freckles which are closest to your skin color will not be treated as much. I have found this leads to a lightening of the freckles without sacrificing the natural beauty of freckles.
If your desired result is to be without freckles, this is more of a chore and may take an additional laser. I use a Q-switched Alexandrite laser to further treat the lighter freckles in patients hoping to achieve a result that approaches completely removing the freckles. Still, these will likely return with sun exposure. That being said, I personally find light freckling natural and beautiful.
Another approach is to use a mild resufacing laser. You might want to look into the Pearl (erbium:glass) or a fractionated erbium "laser peel" like Sciton's microlaser peel. Good luck!