If violent behavior is present and the pair seem stressed or go into battle, this may be normal mating behavior. Mating for most chameleons is typically agressive and sometimes violent. There may be biting, scratching, or even falling to the ground. Just remember that these animals instinctively know how to mate and don't need our help in order to reproduce. Once mated, remove and place the female back in to her enclosure for the duration of gestation.
Gestation periods vary among chameleon species.
Consult the many books available on chameleons and captive management. When a gravid female is seen pacing in her enclosure or attempting to dig in the soil around her potted plant, remove her to a trash can depository. Sticky Tongue Farms uses a clean trash can with about 1 foot of moist potting soil. Soil isn't sterile in nature and we have used potting soil with great results. A small clip-on light is attached and several pieces of sticks or a small bush is added.