Being brutally honest I'm afraid from my experience that does look like it is a stone chip as its too far away from the wheel nuts and I found over 5 years of 370 ownership that the wheels are prone to stone chipping, the wheel design seeming to attract those far more that I saw with the 350 wheels.
Wear and tear I'me afraid, albeit unfortuate for you it so soon after picking the car up.
Bear in mind that I have not heard on a single wheel repair job that has resulted in it matching the others. After 4 years I had all 4 of mine refurbed finally brought on by a very inconsiderate kerb , and very pleased with the powder coat job done, but knew there was no way I could expect a match for the OEM from the factory. Just mention that before you tootle off to the dealer who may take pity on you and offer a repair that may turn out not as you had hoped. Will370z had this issue with his.