I have a different brand of blue quartz (Finest Finish Sparkle Quartz in Laguna) that was plastered only a week ago. I see some color variation, but not as bad as your pics. The mix plus how it was filled could both affect this.
Also -- beware of the autofill when they plaster. They hosed down my patio before they left, and water got down into he autofill cover holes and came out into the pool, leaving a discolored line from the autofill pipe in the pool down to the bottom. As stated by everyone, you don't want any water hitting new plaster and drying up....just fill from the bottom with your hoses.