I've seen Mikimoto Tahitians at Nordstrom that had no visible overtones in the store lighting. They were quite uniform. They certainly weren't low quality, but they didn't appeal to me at all, and I think you would not have cared for them either.
If buying online, when you see a strand you like, ask the vendor for photos in varied light conditions. Not just the glamour shots/ studio light shots.
And only buy from vendors that accept returns, because the ultimate test is how the pearls look on your skin, in the lighting conditions where you live, and with the kind of clothes you like to wear. Yes, the clothes you wear will affect how your pearls look-- some colors make the pearls pop, others not!
Don't forget, many vendors have pearls in stock that are not currently on their websites. So you could also just contact the vendor, describe what you are looking for, and see what they come up with. Inquiring doesn't obligate you to buy.