New freshwater pearl set

Having made the pearl earrings, I wanted to turn it into a set, so I made a necklace as well. Not sure what the stone is, agate or carnelian, but it has a nice translucent shine.
I'm still trying to decide whether I like the brown stone with the pearls. Hubby said a white stone would have matched possibly better. I just didn't have anything that was matching nicely in light colors.