The first picture is the right shape (round) but wrong size. I'm not sure about the display of the colors, either. Vaguely what I'm looking for, yet not. This is mostly all I've found in my travels.
The second picture, with the little triangle, is the closest I've found to exactly what I'm looking for to go with the necklace divaprime gave me. It's small with the right colors yet not too obvious (I don't think, at least).
I went ahead and got the small triangle one. I don't know how often I'll wear it, but probably on occasion.