About to put deposit on engangment ring

hello, I just wanted to check to make sure im getting a good deal on this ring. im going to a local jewelry store. There going to start the CAD for the ring soon but the ring proportions will be a 5.5 ring, platinum band with crossing infinity and one row of diamonds on the infinity. The stone will be a lab grown diamond about 2 carots and will be a green diamond. Should be vivid to deep green, they'll bring in diamonds and Ill choose. I asked about sapphire and mossianite but itll either be more or equal price. I didnt wsnt a emerald because of how brittle it is.

Does 3k seem reasonable for the price of this ring?