Pictures of pearls are a puzzle - never sure what I am looking at unless the type of pearl is very familiar so that the picture recalls a real-life image. There's so much variety among Tahitian pearls, that I am not sure what I am looking at here. [since I'm the lonely skeptic, don' take this too seriously: the problem is not about your pearl]
These being said, the picture seems to show dark pearl with even, easily visible green overtone and no blemishes - good things. Whether the lack of reflection in the pearl is sign that the pearl is dull or that the folks had a more sophisticated camera setup then usual... can't say.
11mm is respectable, although these things get much larger. At 12mm these pearls get to a different level, judging from prices, that is. And that is already quite large among rings. By the time the pearls get 'large' in their own right (~15mm, say) - they need special wearing care as rings, can't 'forget' a ball larger then your knuckle balanced on the back of your palm (which situation has its own charm
)
I like the design of the setting, but can't see anything about the quality of he casting, the pave...
With such pearls offered for $125 (
LINK), the price of the ring OK. But again, I haven't been shopping for precisely this sort of thing recently.
This is about all that comes to mind.
PS. Is the pear or the ring overall more important? You seem to care more about the pearl... To me, it appears that most of the cost is in the ring as a package (the setting that I cannot really evaluate, pearl at the brink of respectable sizes, perhaps very nice too, putting them together etc.)