What is the standard price for 3 carat emerald diamond d color ideal cut with flawless?

There is no standard price for any gemstone. Prices vary according to who's buying and who's selling. In this range, the most important variable will be that you have a GIA certificate attesting to these high qualities.

Today, you can purchase a stone of about three carats with this colour, cut and clarity (internally flawless) and spend between US$111,000+ and US$122,000+. Neither list 'ideal' as the cut, however, but do list Very Good.