Stonescapes Puerto Rico blend: 1 or 2 bags?

I'm looking to resurface my pool with Stonescapes Aqua Blue. I'd like to spring for the Puerto Rico blend (PRB) and abalone shell. My builder is asking if I want 1 or 2 bags of PRB in the mix, saying "the biggest difference being the more Puerto Rico blend per mix the more you will see it". (The difference in price for my 18k gallon pool is $675, for what it's worth.) I'm curious if anyone has installed either option and what it looks like to you. I like the shimmer the glass adds. I want it to show up, but don't want it to look too artificial. I don't know whether 1 bag is imperceptible or 2 bags is over the top. I appreciate any thoughts.