I passed on two occasions sonething that was quite large 1" long and rather nut shaped. it was cream colooured and when I tapped it seemed quite hard. I flipped when i saw the first one and flushed it , but the second one I took it apart and found it was chalk like in the middle. I suspect it was some form of calcium deposit from the liver, softer in the middle and hard on the outside. it came out in both cases about two days after a liver flush. The fact that your specimen had colours attributed to liver stones makes me suspect it was perhaps a similar product!