To be honest the Tahitians are ok ,the look like AA to me , but the colour seems a bit ordinary. In the first photo they don't look like they match at all with one being darker and with better lustre. If they are the same pearls posted with the dark pair they look better but still just ok . They are attractive enough and they are large studs so the price, to me, seems like a normal retail price... if a bit high. So you weren't overcharged but frankly the money might have been spent on slightly smaller with better colour. They came with Gold backs I assume for the price.. ?
The White SS - cream isn't very popular here so I don't know if that has effected the price. And there are the diamonds and gold to be considered.. the lustre looks pretty good.. not sure about the colour as I've not seem pinky cream only pinky white. In the first photo it looks like there are marks near the face but I dont know if its the lighting. Again the price seems fine for what it is and the bail being gold.
The gold SS pair ( like the look of the dangle ones at the bottom) = frankly it's hard to say as the colour is difficult to determine from the photo. I'm thinking they are coming out darker than in RL. But again, the price isn't outrageous.
Seems like you have basically paid retail. I don't think you should buy anymore from there , it's not really a deal. You should go to the Singapore show and find something stunning. Honestly its so hard to buy pearls unless you can see them.