Oh, the spa color is fine, it is a bit lighter than the pool due to the depth but the color is clearly the same. The turquoise flecks are visible in the steps and seat areas. It keeps the color actually a lot better in that regard than most of the photos I've seen of grey based pools where the step is such a grey vs the pool looking blue. My spa is the same color as the pool, just paler.
Oh, yes, that worked! this photo shows the deep end of the pool and the spa, with the wall whale brush there to show how different it is from that sort of blue.
Anyhow, the quartz finish is a great texture, just like the samples in the box and the color is quite consistent even though the plasterer did use calcium chloride accelerator when he told me he would not. There are some pale spots that are probably due to that, or maybe due to the sack of plaster that was torn and stiff but they used anyway (saying it would break up in the blender) but they are not so bad overall.
I think we had an accidental bicarbonate startup due to my high TA water and the plasterer apparently overdoing the bicarb in neutralizing the acid wash. The weird color in the spa on fill up may have been due to less neutralizing in that area. Were I to do it all again, I'd dump a bag of bicarb into the pool and the spa when I had a chance just to hope it was overneutralized if the contractor would not do a real bicarb start.