The Gemstone is called Blue granite opal. Or at least that is what I think. I saw the same of the blue granite, not the blue granite opal, and really liked it in their test pool and the hand held sample as well as what I saw online. I wanted to see a pool completely finished, and I saw one I really liked, when I asked them they said it was the blue granite opal. Basically new version of the Blue granite. It was the blue that I was looking for. Not to light, not to dark, enough other color, but absolutely no green. I did not want even a trace of green. Well, I ordered the blue granite opal and when it was sprayed, I saw some green in the pebbles, which were not there on the sample, but again the sample was the older Blue granite. There was not very much so, so no worries. I turned the water on and with in the first few feet, I noted that the water had a green tinge to it,took close to 40 hours plus with two hoses to fill,

. It definitely had a green color as you see. This coincided with some issues with the house as well, so I pretty much went off the deep end. I hated the color just because I did not want any green. Which is some what odd, because I think the green tinted pools looked better, but I did not want to worry about algae detection ect. I don't know if it is acceptance of the fact that it is toruquois, or the fact that almost everyone that has seen it has commented very positively on the color (with out being prompted). It seems to blend in more naturally with our back yard. Again, don't know if this is my brain coping with it, or I really like it now. I know clarity of the water will help me in my algae paranoia as well as I will be doing more overnight chlorine test, but given the option now to re do it, I wouldn't. Or at least I think I wouldn't.
The builder swears it is the same as the person that I visit. If it is then their can be a HUGE variation of color. I did try to get ahold of a real sample, of the blue granite opal, but he company website is old, does not even list it, and the only contact is via an online response email which does not work, and the builders that they have listed, almost all are non working. I think it is just an old website that is out of date.
Doesn't mater at this time it would be a 20k fix to change it, but I am not. Again, growing on me.
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The above picture is not very good representation, very windy and there is a fine chop on the water, making it look milky and the diving board shot was way to dark.. I will try to get a better pic soon, unfortunately I am home mainly when it is dark so good lighting is hard to come by.