Mine have silver-ros? overtones. I asked for that specifically.
Your analogy (perfect lab created sapphire vs. imperfect natural sapphire) doesn't apply as both freshwater pearls and akoyas are formed of real nacre and both involve human intervention-- the placing of a nucleus into the mussel or oyster. To be analogous to a natural sapphire, the pearl would have to be natural -- not cultured-- and there are very few of those natural pearls around!
In the case of the FW pearl, only a bit of mantle tissue is placed into the mantle of the mussel to stimulate the deposition of nacre, so the resulting pearl is nacre all the way through!
In the case of akoya, a sizeable shell bead is placed into the gonad of the oyster, and nacre is laid down over that, so there is relatively little nacre.
If anything, the FW pearl is closest to a natural pearl.
That said, if her heart is set on akoyas, then so be it....we all want what we want.